| Evaluation of Cross-Correlation Methods on a Massive Scale for Accurate Relocation of Seismic Events in East Asia |
21 APR 2006 |
72 pages |
| Authors:
Paul G. Richards; Felix Waldhauser; Won-Young Kim; David Schaff; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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 | A weakness of traditional methods of seismic event location is their susceptibility to errors in picking arrival times of regional phases such as Pn, Pg, and teleseismic phases. We evaluate the practical utility of waveform cross-correlation as a way to reduce or remove pick error, applied to large datasets in seismically active regions of East Asia, for purposes of obtaining significant improvements in event location. Key ideas in this project ... |
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| Evaluation of Cross-Correlation Methods on a Massive Scale for Accurate Relocation of Seismic Events |
28 SEP 2005 |
11 pages |
| Authors:
Won-Young Kim; Paul G. Richards; David P. Schaff; Felix Waldhauser; Jian Zhang; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| Lamont-Doherty Earth Observatory (LDEO) at Columbia University is evaluating a method of locating seismic sources (earthquakes, explosions) based on the use of waveform cross-correlation (WCC) measurements instead of using the conventional measurements of seismic wave arrival time (phase picks). WCC measurements have been demonstrated to be 10 to 100 times more accurate, where they can be used. The principal issue we are exploring is the extent to which a significant ... |
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| Location, Characterization and Quantification of Hydroacoustic Signals in the Indian Ocean |
OCT 2004 |
60 pages |
| Authors:
M. Tolstoy; D. R. Bohnenstiehl; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| In this final report we summarize research accomplished on the project titled, Location, Characterization and Quantification of Hydroacoustic Signals in the Indian Ocean. Our initial goals were to locate, characterize and quantify hydroacoustic signals recorded on the three available hydroacoustic stations in the Indian Ocean, and this was accomplished for available data through May 2003. However, shortly thereafter our contract was rescoped to focus on high frequency propagation through the ... |
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| Location, Characterization and Quantification of Hydroacoustic Signals in the Indian Ocean |
19 FEB 2004 |
13 pages |
| Authors:
M. Tolstoy; D. Bohnenstiehl; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| Data from three Indian Ocean hydroacoustic stations (Diego Garcia North, Diego Garcia South, and Cape Leeuwin) have been characterized and quantified for the calendar year 2002. These results were delivered in the form of a 2002 catalogue, and are briefly summarized here, with additional consideration of their significance in the overall station characterization. Background noise spectra for each station have been characterized for the entire year and show distinct seasonal ... |
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| Labrador Sea - Convection Data CD-Rom |
JAN 2003 |
10 pages |
| Authors:
Gerd Krahmann; Martin Visbeck; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| This project goal was to collect and assemble all available field data from the ONR sponsored Labrador Sea Deep Convection, Experiment, and to make this data available to interested scientists in the form of an internet site and as CD-ROMs. Maintain LabSea www site at LDEO server. |
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| Studies of the Tsushima Current |
OCT 2002 |
5 pages |
| Authors:
Arnold L. Gordon; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| We followed a coordinated two-pronged approach to advance our understanding of the structure, interannual and seasonal variability of the Japan Sea's Tsushima Current: observational data analysis and theory/modeling. 1) Observational data analysis: Using high quality in situ hydrographic data and TOPEX POSEIDON altimetric data, define the mean, seasonal and interannual variability of Tsushima Current and sea level in the context of the geometry of the eastern boundary of the Japan ... |
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| Ship Operations: R/V EWING Support for REDSOX |
31 DEC 2001 |
2 pages |
| Authors:
Paul W. Ljunggren; John Diebold; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| Five days of physical oceanography CTD casts, O(sup 2) analysis) and two days of transit were carried out in the Red Sea on behalf of the U.S. NAVY by UNOLS ship R/V MAURICE EWING during August, 2001. |
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| Sediment Acoustics |
01 DEC 2001 |
7 pages |
| Authors:
R. D. Stoll; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| This grant has funded work aimed primarily at developing a mathematical model to describe geoacoustic and seismic wave propagation in ocean sediments based on the knowledge of certain primitive variables such as porosity and grain-size distribution. The model is based on the classical Biot theory extended to take into account various mechanisms of energy loss that are known to be important in marine sediments. After the initial development of the ... |
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| Attenuation Of LG Waves in the Eastern Tibetan Plateau |
OCT 2001 |
8 pages |
| Authors:
Jiakang Xie; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| In the past year I have been processing a large amount of regional/ teleseismic data from various broadband seismic stations in eastern Eurasia. Fourier spectra of Pn, Lg and Pg waves were computed for many events and paths to study path attenuations. Among the data collected and processed are Lg spectra collected from the 1991-1992 Tibetan Plateau Passive Experiment. Using these spectra and a standard two-station method that virtually eliminates ... |
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| Seismic Location Calibration for 30 International Monitoring System Stations In Eastern Asia |
Oct 2001 |
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| Authors:
Clint Conrad; Mark Fisk; Vitaly I Khalturin; Won-Young Kim; Igor Morozov; Elena Morozova; Paul G Richards; David Schaff; Felix Waldhauser; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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 | We review the progress of a collaborative academic-industry research consortium, comprised of five institutions, that has started an integrated series of projects to improve the capability to locate seismic events based on data acquired by International Monitoring System (IMS) stations in Eastern Asia. This effort is to develop and deliver validated high-resolution travel time grids for operational use. During the first year of work we have focused on IMS stations ... |
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| Iron and Nitrate Supply to Oregon Coastal Waters: Physical Mechanisms and Biological Response |
18 MAY 2001 |
55 pages |
| Authors:
Zanna Chase; Alexander van Geen; Michael P. Kosro; John Marra; Patricia A. Wheeler; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| Iron and nitrate concentrations were measured at high-resolution underway in surface waters and in vertical profiles off the Oregon coast in July, 1999. Surface Fe and N (nitrate + nitrite) concentrations measured by flow injection analysis ranged from < 0.3 to 20 nmol 1(exp -1) and < 0.1 to 30 mu-mol 1(exp -1), respectively. Total dissolvable Fe concentrations, measured in unfiltered, acidified samples in surface waters and in vertical profiles, ... |
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| Involving an AASERT Student in Marine Geological and Geophysical STRATAFORM Studies |
11 JUN 2000 |
3 pages |
| Authors:
Gregory S. Mountain; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| The goal of STRATAFORM is to link short-term biological and physical processes affecting sedimentation ("event" stratigraphy" developed over hours to weeks) to the stratigraphic geometry and faces distribution of the upper 100 m of continental margin sediments representing 106 years of preserved record. Three groups of processes have been isolated for study by STRATAFORM investigators: 1) shelf sediment dynamics and the development of lithostratigraphy; ... |
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| Incorporation of Radionuclides in Arctic Sea Ice |
25 APR 2000 |
2 pages |
| Authors:
Stephanie L. Pfirman; Robert F. Anderson; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| Sea ice from the Kara Sea is widely distributed: to the Laptev Sea in the east, to the Transpolar Drift Stream in the Arctic Basin to the north, and to the Barents Sea in the west. Although this distribution raises the potential for widespread distribution of ice contaminated by radionuclides, values obtained in this study were low, due to the location of sampling, and other factors. ... |
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| Tritium/He-3 and O-18 Measurements During the ACSYS Expedition 1996 |
20 APR 2000 |
3 pages |
| Authors:
Peter Schlosser; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| This proposal requested half the funds required for collection, measurement, and interpretation of about 500 tritium/He-3 and 500 O-18 samples in the framework of the Swedish/German ACSYS (Arctic Climate System Study) cruise to the eastern Arctic Ocean in 1996. The work was focused on closing the existing tracer data gap in the eastern part of the Eurasian Basin. Coverage of this part of the Arctic ... |
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| Enhancement of the Release of Scientific Data in the Framework of Scientific Publishing |
20 APR 2000 |
4 pages |
| Authors:
Peter Scholosser; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| This proposal requested support for exploring a more rapid data release in the framework of the Journal of Geophysical Research (Oceans) Editorship. The goal is to develop a policy that would require data release at the same time as publication of the first scientific description of the research project that produced the data. Design and implementation of the policy should emphasize incentives and advantages of early ... |
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| Deep Water Formation and Circulation in the Arctic Ocean Studies by Natural and Anthropogenic Tracers |
01 MAR 1999 |
5 pages |
| Authors:
Peter Schlosser; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| Funds were requested for completion of measurements of tracer samples (tritium, helium isotopes, oxygen isotopes, C14) from the ARCTIC 91 expedition, as well as for the interpretation of these data. Additionally, funds were requested for participation in an icebreaker expedition to the Arctic Ocean originally planned for 1995. This cruise could not be organized. Therefore, the funds were used for sample collection in the framework of the 1994 joint U.S./ ... |
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| Ocean Circulation and Mixing Relevant to the Global System |
05 FEB 1999 |
8 pages |
| Authors:
Arnold L. Gordon; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| The Arlindo Project was conceived to investigate the oceanography of the Indonesian seas in a joint oceanographic research endeavor of Indonesia and the United States. Inter-ocean transport within the Indonesian Seas plays a key role in the global thermohaline circulation, and is relevant to ENSO as it allows seepage of the western Pacific's warm pool water into the Indian Ocean, adjusting the volume of the warm pool. Mixing processes within ... |
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| Variability of the Circulation in the European Polar Seas |
01 FEB 1999 |
3 pages |
| Authors:
Peter Schlosser; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Our primary goal was to study formation rates, pathways and mean residence times of the deep waters in the basins of the European Polar Seas. Evaluation of the tritium/(exp 3)He time series for the Greenland Sea Deep Water spanning the period between 1972 and 1988 yielded the surprising result of a drastic reduction in Greenland Sea Deep Water formation from about 0.5 Sv to 0.1 Sv starting around 1980. However, ... |
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| Administration and Ship Costs |
13 JAN 1999 |
2 pages |
| Authors:
Arthur Lerner-Lam; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This award was funded for the administration of ONR awards and ship costs. Funding received for Administration and Ship Costs were distributed into two accounts. The Administration budget, totaling $83,367, was spent on costs associated with the administration of the various ONR awards. These costs included clerical staff salary support for assistance with the preparation and distribution of the various ONR proposals, and for assistance with implementation of the ONR ... |
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| Administration and Ship Costs |
13 JAN 1999 |
2 pages |
| Authors:
Arthur Lerner-Lam; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This award was funded for the administration of ONR awards. The Administration and Ship budget, totaling $32,238, consisted of funding associated only for the administration of the various ONR awards. These costs included clerical staff salary support for assistance with the preparation and distribution of the various ONR proposals, and for assistance with implementation of the ONR site reviews. Costs associated with the processing of the Omnibus proposal, such as ... |
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| Experimental and Theoretical Studies of Near-Bottom Sediments to Determine Geoacoustic and Geotechnical Properties |
14 DEC 1998 |
5 pages |
| Authors:
R. D. Stoll; R. Flood; E. O. Bautista; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| In a program designed to develop methods for predicting and measuring certain geoacoustic and geotechnical properties of the sediments immediately beneath the sea floor, several new tools were developed to measure in situ properties such as undrained shear strength, shear wave velocity and angle of internal friction. These tools include a motorized penetrometer designed to measure quasi static cone penetration resistance up to depths of two meters into the bottom, ... |
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| A Low-Cost, Compact, Moored Spectral Radiometer |
20 JUL 1998 |
33 pages |
| Authors:
M. Maccio; J. Marra; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| A new type of spectral irradiance meter is described, that offers compact operation, 32 wavelengths of downwelling irradiance, and low cost. The unit is currently configured to be attached to a mooring to measure the change in spectral irradiance over time at prescribed depths. Data from a mooring in the Arabian Sea are presented, and clearly show the change in spectral quality after the onset of the SW monsoon. The ... |
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| Seismic Source and Structure in Iran from Joint Seismic Program Array Data |
25 FEB 98 |
54 pages |
| Authors:
Won-Young Kim; V. Aharonian; A. L. Lerner-Lam; Paul G. Richards; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Our Final Report consists of the paper titled "Discrimination of Earthquakes and Explosions in Southern Russia using Regional High-Frequency Three-Component Data from the IRIS/JSP Caucasus Network." In this paper, we analyzed high-frequency regional records from small earthquakes (magnitude <4.5) , and comparable magnitude chemical explosions to find a reliable seismic discriminant in southern Russia near Kislovodsk. The digital, three-component seismograms recorded during 1992 by the Caucasus Network operated by Lamont- ... |
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| Stratification Mixing and Circulation of the Indonesian Seas-Arlindo Phase 1 and 2. Including AASERT: Mixing and Time Variability in the Indonesian Seas |
FEB 1998 |
6 pages |
| Authors:
Arnold L. Gordon; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| The Arlindo Project is an ongoing joint oceanographic research endeavor of Indonesia and the United States. The field phase of Arlindo began in 1993 with Arlindo Mixing. Phase II of the program, Arlindo Circulation, is jointly funded by NSF and ONR. The ONR contribution to Phase II of Arlindo contributed to the collection and analysis of CTD data collected during the Arlindo Circulation mooring deployment cruise which was carried out ... |
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| Seismic Sources in China and Korea |
FEB 1998 |
71 pages |
| Authors:
Paul G. Richards; Won-Yong Kim; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This final report is in four parts, consisting of: (1) a five-page summary of Ph. D. thesis of Jinghua Shi entitled "Quantification of Earthquakes based on Improved Estimates of Energy using Regional Waves"; (2) an application of methods developed by this thesis, to estimate the spatial variability of seismic wave attenuation in Western China; (3) a description of an unusual swarm of seismic activity in Western China; and (4) a ... |
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| Evaluation of Chemical Explosions and Methods of Discrimination for Practical Seismic Monitoring of a CTBT |
DEC 1997 |
56 pages |
| Authors:
Vitaly I. Khalturin; Tatyana G. Rautian; Paul G. Richards; Won-Young Kim; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Our Final Report is in three parts. Part one is a stand-alone paper, submitted for publication, entitled "The Seismic Signal Strength of Chemical Explosions." In this paper, we have compared the seismic magnitude of a wide variety of chemical explosions to the magnitude expected for explosions set off in hard rock under conditions most favorable for generating strong seismic signals. We define the deficit of ... |
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| Enhancing Shallow Seismic Reflection Profiles Using Nonlinear Correlation: Applications to the New Jersey Margin |
APR 97 |
4 pages |
| Authors:
Gregory S. Mountain; Peter Buhl; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Some older Multichannel Seismic data recorded on the shallow continental shelf do not properly image the upper few 100 m. This is due to a large (approx. 200 m) minimum source receiver offset. Nonlinear Correlation, used successfully for other seismic processing was not able to correct the data. The use of a short (Approx. 30 m) minimum source receiver offset produces excellent seismic images of the upper sediments. |
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| High Resolution Seismic Surveying for Pleistocene Sequence Stratigraphy New Jersey Continental Shelf and Upper Slope in Support of Strataform |
27 MAR 97 |
5 pages |
| Authors:
Gregory Mountain; Peter Buhl; Kenneth Miller; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This contract provided support to plan, acquire, and process high resolution multichannel seismic reflection data offshore New Jersey during cruise 270 of the R/V Oceanus. This was part of the STRATAFORM initiative that seeks geologic and geophysical data on the continental terrace at temporal and spatial scales ranging from 0.1 to 100000 yrs and .01 to 1000 m. Our cruise objectives were to collect high resolution reflection images of stratal ... |
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| Towards Predicting Deep Convection in the Labrador Sea |
MAR 1997 |
9 pages |
| Authors:
Martin Visbeck; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| We have developed and implemented a method to use real time oceanographic data in conjunction with climatological air-sea flux data to predict the location and strength of deep convection in the Labrador Sea a few weeks in advance. In preparation for this task we have gathered and analyzed a number of historical and recent data sets. In particular the results of a recent mooring deployment during the winter of 1994-1995 ... |
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| Bioluminescence and Optical Variability in the Sea ('Marine Light - Mixed Layers'): Moored Observations in the North Atlantic Ocean |
28 FEB 97 |
21 pages |
| Authors:
C. Ho; C. Langdon; M. Maccio; J. Marra; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| The Marme Light - Mixed Layers mooring was deployed south off Iceland at 59035.6'N/ 20057.9'W, from April 29 (day 119) to September 06 (day 249), 1991. The subsurface moored array included five Multivariable Moored Sensors (MVMS). This report discusses data collected by three MVMS, deployed at 30 m,70 m and 90 m, and designed, prepared and implemented by LDEO. The two others were deployed by the Ocean Physics Group of ... |
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| Stratification Mixing and Circulation of the Indonesian Seas |
1997 |
6 pages |
| Authors:
Arnold L. Gordon; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| The Arlindo Project is an ongoing joint oceanographic research endeavor of Indonesia and the United States. The field phase of Arlindo began in 1993 with Arlindo Mixing. Phase II of the program, Arlindo Circulation, is jointly funded by NSF and ONR. The ONR contribution to Phase II of Arlindo contributed to the collection and analysis of CTD data collected during the Arlindo Circulation mooring deployment cruise which was carried out ... |
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| The Forced Upper Ocean Dynamics Experiment in the Arabian Sea: Results from the Multi-Variable Moored Sensors from Deployment-2 of WHOI Mooring |
19 DEC 96 |
35 pages |
| Authors:
C. Ho; C. S. Kinkade; C. Langdon; M. Maccio; J. Marra; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Multi-variable moored system were used to collect physical and bio- optical data over a six month period in the Arabian Sea (l5 30'N/6l 30'E) from Apr. 22, '95 to Oct. 20, '95. We present data from MVMS' positioned at 10 and 65 m depth. Calibration and validation issues are considered in the presentation of data. |
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| The Forced Upper Ocean Dynamics Experiment in the Arabian Sea: Results from the Multi-Variable Moored Sensors from Deployment-1 of the WHOI Mooring |
25 JUL 96 |
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| Authors:
C. Ho; C. S. Kinkade; C. Langdon; M. Maccio; J. Marra; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
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| Evaluation of Chemical Explosions and Methods of Discrimination for Practical Seismic Monitoring of a CTBT |
JUN 96 |
167 pages |
| Authors:
Vitaly I. Khalturin; Tatyana G. Rautian; Paul G. Richards; Won-Young Kim; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Following a general introduction, our first annual technical report is in two parts. The first part, is an overall description of the data that we have acquired so far. We briefly characterize the status of our data collection efforts for twenty four separate areas of the former Soviet Union. For those areas for which we have significant data, we give Tables and Figures characterizing our data. The second part, prepared ... |
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| Portable High-Resolution Multichannel Seismic System User Guide |
APR 96 |
12 pages |
| Authors:
John B. Diebold; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This DURIP award funded the acquisition of the basic components of a new, portable, high resolution MCS system. Equipment will allow ONR and NSF-fund researchers to image sedimentary structures in a variety of geologic settings but particularly appropriate for shallow water applications. Major items purchased were the 48-channel hydrophone array, four of the seven depth controllers for that array, and the compressor, which supplies air for the source array. ... |
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| Characterization of Seismic Source and Path in Central Eurasia Using Digital Seismograms from Borovoye Observatory, Northern Kazakhstan |
04 FEB 96 |
76 pages |
| Authors:
Won-Young Kim; Paul G. Richards; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This report is in three sections: (1) Decribes RMS Lg measurement for five Chinese nuclear explosions at Lop Nor recorded digitally at Borovoye, Kazakhstan (station BRVK). The regression shos scatter only a 0.045 magnitude units against ISC mb(P). (2) Summarizes a new method to determine the response of digital seismographs from their transient calibration pulses by iterative inverse technique. The method is use to derive complete instrument responses for STsR-TSG ... |
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| An Evaluation of Methods for Estimating Regional Heat Flow |
SEP 95 |
15 pages |
| Authors:
Dallas Abbott; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| We look at 3 methods for estimating the regional heat flow: a simple mean of all heat flow measurements, the heat flow at the regional median depth, and the mean of gridded heat flow measurements. We find that the simple mean is the least accurate method: simple means estimate the average heat flow at the median water depth of the heat flow survey and are often significantly biased. The heat ... |
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| Discrimination of Earthquakes and Explosions in Southern Russia Using Regional High-Frequency Data from IRIS/JSP Caucasus Network, |
14 AUG 1995 |
10 pages |
| Authors:
W. Y. Kim; V. Aharonian; G. Abbers; A. Lerner-Lam; P. Richards; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| High frequency regional records from small earthquakes (magnitude < 4.5), and comparable magnitude chemical explosions, are analyzed to find a reliable seismic discriminant in the Northern Caucasus region in Southern Russia. About 130 digital, vertical-component seismograms recorded during 1992 by the IRIS/JSP North Caucasus Network operated by Lamont-Doherty Earth Observatory since 1991 in the distance ranges 10 to 250 km are used. Mean Pg/Lg spectral ratios in the high frequency ... |
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| Lower Crustal and Upper-most Mantle Structure beneath Station WMQ, China by using Teleseismic P-wave Polarization Signals, |
14 AUG 1995 |
9 pages |
| Authors:
Liping Gao; Paul G. Richards; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| We have applied a polarization tomographic inversion to the single station WMQ to retrieve the velocity structure of the lower crust and upper-most mantle in the vicinity of Lop Nor. 828 teleseismic P-wave waveforms with event magnitude Mb > 5.0 around the world with excellent coverage of back azimuth were collected and are used to measure polarization anomalies. In addition, 39 PKP signals are used. Inversion results reveal a low ... |
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| Statistics on Mine Blasting and Blasting Signals in Different Regions: Preliminary Results from Russia and Kazakhstan, |
14 AUG 1995 |
10 pages |
| Authors:
Vitaly I. Khalturin; Tatyana G. Rautian; Paul G. Richards; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| We have recently begun a project to document the numbers of mine blasts that will be detected teleseismically, and at regional distances, by seismograph networks used to monitor compliance with a Comprehensive Test Ban Treaty. We plan to study blasting in the United States, in countries of the former Soviet Union, and in Australia, Canada, China, and Korea. Knowledge of mine blast statistics is needed in order to plan efforts ... |
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| The Multi-Factor Model of Magnitude Residuals and the Problem of the Precise Determination of Magnitude |
OCT 94 |
182 pages |
| Authors:
T. G. Rautian; V. I. Khalturin; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Station corrections for hundreds of stations and seismic waves dynamic data in many regions were jointly analyzed to study the statistical structure of seismic magnitude deviation. The multi-factor model of station residuals is proposed. It was found that total deviation of magnitudes (0.4 magn. units for EQs and 0.34 for UNEs) is formed by a set of components: (1) Site effects component S1 is equal to 0.10. (2) Area of ... |
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| Satellite Imagery and Topographic Data in Verification |
28 SEP 93 |
127 pages |
| Authors:
David Simpson; Arthur Lerner-Lam; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| Analysis procedures, hardware platforms and software systems for the analysis of digital topographic data, satellite images, and generic time series have been developed. These have been implemented in a distributed processing environment on commonly available platforms and are available over Internet. Contact lerneratldeo.Columbia.Edu for details. Our imaging analysis methodologies have been applied to the southern border regions of the former Soviet Union. This area contains some of the most interesting ... |
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| RMS Lg Studies of Underground Nuclear Explosions in the U.S.S.R. and the U.S |
19 AUG 93 |
123 pages |
| Authors:
Paul G. Richards; W. -y. Kim; G. Ekstrom; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This final report is in six sections. Section one describes a new method for interpreting radiation patterns of surface waves from underground nuclear explosions at the Balapan Test Site, East Kazakhstan. We add information from body waves and RMS Lg, to conclude that strike directions of inferred faulting lie in the range 90 deg to 120 deg. This section has an Appendix. Section two describes a successful method, based on ... |
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| Digitization and Reanalysis of Analog Sonobuoy (ASPER) Records |
29 JUL 93 |
5 pages |
| Authors:
John B. Diebold; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| This project involved a multifaceted approach for making the database of analog sonobuoy records and solutions at Lamont more accessible to NAVO (stennis) personnel. Each item on a list of seven deliverables was transmitted to NAVO, either in person or by electronic mail: (1) New raytraced solutions of thirty-eight shallow-water sonobuoys recorded aboard Lamont ships in the East China Sea were obtained by iterative ... |
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| An Evaluation of an In Situ Fluorometer for the Estimation of Chlorophyll a |
MAY 93 |
41 pages |
| Authors:
John Marra; Christopher Langdon; LAMONT-DOHERTY EARTH OBSERVATORY PALISADES NY
|
| In situ fluorometers are evaluated in their estimation Of chlorophyll a. Calibrations from at-sea and laboratory data showed linear relationships between fluorescence and chlorophyll a as measured by in situ fluorometers with r 2 > 0.9. Examination of regression residuals showed an increasing error variance with the magnitude of chlorophyll on two of four cruises. The most likely source of this increasing error variance was in one case, a photoadaptation ... |
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