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- W2141036230 abstract "In most local earthquake tomography (LET) studies the data are selected according to the azimuthal-gap (GAP) criterion, which means rejecting all the sources outside the station network perimeter. In this article I show that in some cases this cri- terion is inappropriate and can be a reason for significant decimation of the relevant data, in turn leading to lower quality inversion results. This study presents several qua- litativeandquantitativeargumentsforwhytheGAPcriterionisnotadequate.Thefactof great importance to out-of-network events for improving the results of tomographic inversion is supported by synthetic testing using realistic distribution of events in the area of Central Java and station locations according to the Merapi Amphibious Ex- periments project. I consider three models with different criteria of event selection: (1) dataset with GAP < 180°, (2) dataset with GAP < 280°, and (3) dataset with all events within a radius of 5°. The synthetic modeling reproduces the real situation when neither coordinates of sources nor starting 1D models are initially known. The recon- structionresultsshowthatthebestresolutionisobtainedformodel3withalldataavail- able, while the worst solution is observed in model 1. This study demonstrates that the commonlyusedGAPcriterionthatrejectstheout-of-networkeventsisinjuriousforLET tomography. In future experiments and when reconsidering the old datasets, I encour- age the use of data from all events to improve the results of tomographic inversion, though at large distances from networks (at least, up to 400-500 km)." @default.
- W2141036230 created "2016-06-24" @default.
- W2141036230 creator A5091517027 @default.
- W2141036230 date "2009-07-29" @default.
- W2141036230 modified "2023-10-10" @default.
- W2141036230 title "Out-of-Network Events Can Be of Great Importance for Improving Results of Local Earthquake Tomography" @default.
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- W2141036230 doi "https://doi.org/10.1785/0120080365" @default.
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