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Integration of arrival-time datasets for consistent quality control; a case study of amphibious experiments along the Middle America Trench

Melissa Moore-Driskell, Heather R. DeShon, Wolfgang Rabbel, Martin Thorwart, Yvonne Dzierma and Ivonne G. Arroyo
Integration of arrival-time datasets for consistent quality control; a case study of amphibious experiments along the Middle America Trench
Bulletin of the Seismological Society of America (October 2013) 103 (5): 2752-2766

Abstract

We have integrated waveform and arrival-onset data collected in Costa Rica as part of the National Science Foundation (NSF)-sponsored Costa Rica Seismogenic Zone Experiment (CRSEIZE) and along central Costa Rica and Nicaragua as part of the German SFB 574 program. The five arrays, composed of different sensor types (one- and three-component land and ocean bottom seismometers and hydrophones), were archived using different software packages (Antelope and SEISAN) and were automatically and manually picked using various quality criteria resulting in a disparate set of pick weights. We evaluate pick quality using automated arrival detection and picking algorithm based on the wavelet transform and Akaike information criterion picker. The consistency of the arrival information over various scales provides a basis for assigning a quality to the analyst pick. Approximately 31% of P arrival times and 26% of S times have been classified as high-quality picks (quality 0-1). An additional 21% of P times and 27% of S arrivals are good quality (quality 2-3). The revised quality picks are mapped directly into new pick weights for inversion studies. We explore the effect of new weighting and removal of poor data by relocating hypocenters through a minimum 1D velocity model and conducting double-difference local earthquake tomography (LET). Analysis of the hypocenter relocation and seismic velocity tomography results suggest that using the improved quality determinations have a greater effect on improving sharpness in the velocity images than on the magnitude of hypocentral movement.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 103
Serial Issue: 5
Title: Integration of arrival-time datasets for consistent quality control; a case study of amphibious experiments along the Middle America Trench
Affiliation: University of Memphis, Center for Earthquake Research and Information, Memphis, TN, United States
Pages: 2752-2766
Published: 201310
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 72
Accession Number: 2013-083955
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch maps
N08°00'00" - N12°00'00", W88°00'00" - W84°00'00"
Secondary Affiliation: Christian Albrechts University of Kiel, DEU, GermanyHelmholtz Centre for Ocean Research, DEU, Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201349
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