Development of Improved Capabilities for Depth Determination

摘要

The objective of this research is to develop improved procedures and criteria for identification and validation of seismic depth phases. This effort includes: (1) inspection of waveforms for events in the Reviewed Event Bulletin (REB) to determine whether depth phases have been identified properly; (2) evaluation of existing procedures and criteria for depth-phase validation; (3) development of statistical methods to quantify the moveout of pP-and sP-P, accounting for timing uncertainties; (4) investigation of techniques to improve depth-phase identification (i.e., F-detector, optimal frequency/filtering tool, and the relative amplitude (RAMP) technique as a test of whether teleseismic P and depth phases fit a double-couple mechanism); and (5) implementation, testing and evaluation, and delivery of software capabilities for improved depth-phase identification and validation to the Center for Monitoring Research (CMR).