GT Merge Process: Version 2.0

Flanagan, M P ; Dodge, D ; Myers, S C

关键词: LANL;    LAWRENCE LIVERMORE NATIONAL LABORATORY;    ORIGIN;    QUALITY CONTROL;    VELOCITY;   

DOI  :  10.2172/948965
RP-ID  :  LLNL-TR-410856
PID  :  OSTI ID: 948965
Others  :  TRN: US200909%%368

学科分类：地球科学(综合)

美国|英语

来源: SciTech Connect

【 摘 要 】

This document summarizes the process used to merge GT25 and better data between LANL and LLNL. The merge also includes OUO arrivals provided by AFTAC for events in the merge. The merge process is mostly automated and includes extensive quality control operations at each step. Events in common between the labs are identified and resolved using GT level criteria. Arrivals in common between the labs are also resolved through the use of agreed upon arrival author rankings. Finally, baselined origin times are computed for all crustal events using either teleseismic P-arrivals and the iasp91 model or, in certain regions, regional P-arrivals and regional velocity models that are known to be consistent with teleseismic iasp91 P-wave predictions. We combine the core tables from each contributor and resolve unique and common GT events between contributors. Next, we merge at the pick level so that each distinct EVENT-STATION-PHASE tuple has a unique arrival. All BMEB (Bondar-Myers-Engdahl-Bergman) GT are recalculated and evaluated for adherence to their criteria. Finally, new origin times are computed (baselining) for the merged GT events. In addition to the reconciliation of events and picks between contributors, the merge process involves several quality control steps that are intended to remove outlier and irrelevant data from the final results. The process is described in the section entitled 'Merge Steps'.