Path Calibration, Source Estimation and Regional Discrimination for the Middle East and Western Mediterranean.
Abstract
In our efforts to calibrate regional crustal paths and upper-mantle teleseismic effects for the Middle East and North Africa we have extended the coverage to include the Western Mediterranean and North Africa, a region of sharp lateral variations in the crustal waveguide. Such calibration is for use in regional magnitude corrections and path attenuation relations. We have established a regionalized zonation of surface wave paths at longer periods (T> 15 secs) and presently have a first-order working model for Pnl propagation across old oceanic paths. In the area previously calibrated -- centered about the Pamir-Hindu Kush region, and covered by the IMS b-stations NIL and AAK, we have analyzed the performance of our source location and characterization methods to smaller (4 > ML> 3) earthquakes using data from co-located or nearby temporary arrays. We establish from this analysis that two broadband three-component stations can provide useful location and depth estimates for small regional events with few (1 or 2), if any, teleseismic observations. A serendipitous result of this work is a depth estimator based on a signal's S-wave complexity. This technique is also complimentary to the short- period:long-period (Esp-pz:Eip-3) discriminant.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1996
- Accession Number
- ADA323774
Entities
People
- B. B. Woods
- C. K. Saikia
- H. K. Thio
- Lingling Zhu
- Xingrui Song