| Discrimination, Detection, Depth, Location, and Wave Propagation Studies Using Intermediate Period Surface Waves in the Middles East, Central Asia, and the Far East |
JUL 2003 |
152 pages |
| Authors:
Anatoli L. Levshin; Michael H. Ritzwoller; COLORADO UNIV AT BOULDER DEPT OF PHYSICS
|
 | The objective of this research was to construct surface wave group velocity maps at intermediate periods for the Near East, Central Asia and the Far East and to estimate the possibility of using these maps to extract weak surface wave signals and measure their amplitude spectra. To reach these goals we acquired broadband digital records of more than 1600 events that occurred in and around Eurasia during the period 1976-1998 ... |
|
| Feasibility of the Use of 3D Models to Improve Regional Locations in W. China, Central Asia, and Parts of the Middle East |
09 SEP 2002 |
61 pages |
| Authors:
Michael H. Ritzwoller; Nikolai M. Shapiro; Anatoli L. Levshin; Eric A. Bergman; Eric R. Engdahl; COLORADO UNIV AT BOULDER DEPT OF PHYSICS
|
| We have assembled a data set of nearly 1000 events across Eurasia and N. Africa whose locations and origin times are known with high accuracy. These events which occur in 23 event clusters, the groomed P and Pn arrival time data observed at regional distances, and about 1000 empirical phase path anomalies create a Ground Truth (CT) data base to be used to assess the quality of 3-D models and ... |
|
| Development of Discrimination, Detection, and Location Capabilities in Central and Southern Asia Using Middle-Period Surface Waves Recorded by a Regional Array |
10 JUN 1997 |
57 pages |
| Authors:
Anatoli L. Levshin; Michael H. Ritzwoller; COLORADO UNIV AT BOULDER DEPT OF PHYSICS
|
| This report presents the results of a study of the dispersion characteristics of intermediate period broadband fundamental surface waves propagating across Central Asia, Western China, and parts of the Middle East. We present group velocity maps from 10 s to 40 s period for both Rayleigh and Love waves. Broadband waveform data from about 600 events from 1988 - 1995 recorded at 83 individual stations from several global and regional ... |
|
| Eurasian Surface Wave Phenomenology and Inversion for Crustal and Upper Mantle Structures |
10 FEB 97 |
92 pages |
| Authors:
Anatoli L. Levshin; Michael H. Ritzwoller; COLORADO UNIV AT BOULDER DEPT OF PHYSICS
|
| Earthquake seismograms recorded by several global and regional networks between 1988 and late 1995 were used to measure the group velocity dispersion of fundamental Rayleigh and Love waves crossing Eurasia. More than 9, 000 three component long period seismograms following more than 600 events with Ms greater than 4.5 were processed. This data set was reduced by clustering observations along similar paths into measurements along the unique path, and rejecting ... |
|
| High Resolution Intermediate Period (10-40 s) Group Velocity Variations Across Central Asia |
10 AUG 96 |
22 pages |
| Authors:
Anatoli L. Levshin; Michael H. Ritzwoller; COLORADO UNIV AT BOULDER DEPT OF PHYSICS
|
| This research is dedicated to investigating the relevance and use of intermediate period (10 - 40 s) surface wave data in problems of detection, discrimination, and the accurate location of small events using regional array data. It is focused on the analysis of data from events throughout Central and Southern Asia within 27 degrees of the Kyrgyz Telemetered Seismic Network. The main efforts during the 1 year time period covered ... |
|
| Development of Discrimination, Detection, and Location Capabilities in Central and Southern Asia Using Middle-Period Surface Waves Recorded by a Regional Array |
10 JAN 96 |
30 pages |
| Authors:
Anatoli L. Levshin; Michael H. Ritzwoller; COLORADO UNIV AT BOULDER DEPT OF PHYSICS
|
| This research is dedicated to the investigation of the relevance and use of intermediate period (5 - 25 s) surface wave data in problems of detection, discrimination, and the accurate location of small events using regional array data. It is focused on analysis of data from earthquakes throughout Central and Southern Asia and the Middle East and nuclear explosions at Lop Nor within 15 - 25 degrees of the Kyrghiz ... |
|
Reports by Author
