Complete regional waveform modeling to estimate seismic velocity structure and source parameters for CTBT monitoring

Conference · Fri Jul 23 04:00:00 EDT 1999

OSTI ID:14654

Bredbeck, T ^[1]; Rodgers, A; Walter, W

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1. LLNL

The velocity structures and source parameters estimated by waveform modeling provide valuable information for CTBT monitoring. The inferred crustal and uppermost mantle structures advance understanding of tectonics and guides regionalization for event location and identification efforts. Estimation of source parameters such as seismic moment, depth and mechanism (whether earthquake, explosion or collapse) is crucial to event identification. In this paper we briefly outline some of the waveform modeling research for CTBT monitoring performed in the last year. In the future we will estimate structure for new regions by modeling waveforms of large well-observed events along additional paths. Of particular interest will be the estimation of velocity structure in aseismic regions such as most of Africa and the Former Soviet Union. Our previous work on aseismic regions in the Middle East, north Africa and south Asia give us confidence to proceed with our current methods. Using the inferred velocity models we plan to estimate source parameters for smaller events. It is especially important to obtain seismic moments of earthquakes for use in applying the Magnitude-Distance Amplitude Correction (MDAC; Taylor et al., 1999) to regional body-wave amplitudes for discrimination and calibrating the coda-based magnitude scales.

• Research Organization: Lawrence Livermore National Lab., CA (US)
• Sponsoring Organization: USDOE Office of Defense Programs (DP) (US)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 14654
• Report Number(s): UCRL-JC-134308; GC0402000; GC0402000
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
AMPLITUDES
CTBT
EARTHQUAKES
EXPLOSIONS
MONITORING
TECTONICS
VELOCITY
WAVE FORMS