Extension of the Caucasus Seismic Information Network Study into Central Asia
Abstract
The Central Asian Seismic Research Initiative (CASRI) is an extension of the Caucasus Seismic Information Network (CauSIN). Both projects seek to build knowledge bases of geological, geophysical, and seismic information in their respective regions and to use crustal modeling techniques to create a combined model of the regions to aid in seismic monitoring. Catalog and phase arrival data from local networks in the CASRI region (Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan) have been collected. The historical catalog contains nearly 11,000 events from 500 AD through the present. The modern catalog of the region includes 469 events from 1991 to 2005. Participants in the project are validating data quality and preparing phase arrival tables. Because these data have never before been shared with the world-wide seismic community, care is being taken to use consistent station naming and descriptions for each station. The phase arrival data from Kazakhstan includes 2,991 seismic phases for 71 events in Kazakhstan and 2,257 phases for events in other countries in the region. Kyrgyzstan's phase data include 2,500 arrivals picked from roughly half of the events in the country; local scientists are continuing to make picks from the rest of their data and will eventually expand to pick times from events in the other CASRI countries. Other new acquisitions include newly released explosion data in paper print-out format, which provide ground truth and are invaluable to crustal tomography and validation of earth models. These data include 600 records from 177 events and 33 stations. Event-station separations range from 450 to 2,500 km. These data are in the process of being digitized. This seismic travel time data, combined with the available geophysical and tectonic information, will be used for the tomographic modeling of the CASRI region.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2007
- Accession Number
- ADA518884
Entities
People
- Eileen S. Vergino
- Levent Gulen
- M. N. Toksoz
- Mary L. Krasovec
- Randolph J. Martin
- Spring A. Romer
- William Foxall
Organizations
- Lawrence Livermore National Laboratory