Magnitude-Yield and Travel-Time Calibration of Northern Eurasia Using Deep Seismic Sounding Data Sets
Abstract
Travel-time and magnitude-yield calibration of Northern Eurasia which is largely aseismic, can be improved by using the large chemical and peaceful nuclear explosion (PNEs) seismic data sets that resulted from the Soviet Deep Seismic Sounding (DSS) program. Eleven major data sets of this program have recently been digitized and become available to nuclear test monitoring research. In this study. we extend this database by including the source ground truth parameters (charge type & sizes. and other relevant information where available) of the chemical explosions and digitizing several earthquake data sets acquired along the DSS profiles. For seamless data exchange with the test monitoring community, we incorporate the waveforms and ancillary data into the National Nuclear Security Agency (NNSA) database schema. To date. we have assembled a database of frequency-dependent code parameters from the PNEs and performed their preliminary interpretation. By utilizing a new developed parallelized version of the one-dimensional (ID) reflectivity program. we also extended synthetic modeling to the full DSS frequency band(O.5-2O Hz) in velocity models of realistic crustal complexity. This modeling suggests that compared to the mantle. the crust plays the most significant role in relating the observed coda decay parameter (Q) to the intrinsic (elastic and inelastic) dependence, and also that leaking of the seismic energy into the mantle could account for the strong frequency dependence of the observed coda Q. Based on the resulting empirical relationship, we improve our previous measurements of the bulk crustal Q(f) along profile QUARTZ.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2006
- Accession Number
- ADA457090
Entities
People
- Chaoying Zhang
- Elena A. Morozova
- Glenn Chubak
- Igor A. Lipovetsky
- Igor B. Morozov
- W. S. Phillips
Organizations
- University of Wyoming