International Data Centre: Reviewed Event Bulletin vs. Waveform Cross Correlation Bulletin
Dmitry Bobrov, John Coyne, Jeffrey Given, Urtnasan Khukhuudei, Ivan, Kitov, Kirill Sitnikov, Spilio Spiliopoulos, and Lassina Zerbo

TL;DR
This study evaluates waveform cross-correlation for automatic aftershock detection of the 2012 Sumatera earthquake, comparing it with the Reviewed Event Bulletin, and demonstrates its effectiveness in identifying and reviewing seismic events.
Contribution
It introduces a method using waveform cross-correlation with selected stations to enhance automatic aftershock detection and compares results with the official Reviewed Event Bulletin.
Findings
Cross-correlation detected approximately 1,000,000 signals.
2763 event hypotheses were generated and reviewed.
The method improved detection sensitivity and event hypothesis generation.
Abstract
Our objective is to assess the performance of waveform cross-correlation technique, as applied to automatic and interactive processing of the aftershock sequence of the 2012 Sumatera earthquake relative to the Reviewed Event Bulletin (REB) issued by the International Data Centre. The REB includes 1200 aftershocks between April 11 and May 25 with body wave magnitudes from 3.05 to 6.19. To automatically recover the sequence, we selected sixteen aftershocks with mb between 4.5 and 5.0. These events evenly but sparsely cover the area of the most intensive aftershock activity as recorded during the first two days after the main shock. In our study, waveform templates from only seven IMS array stations with the largest SNRs estimated for the signals from the main shock were used to calculate cross-correlation coefficients over the entire period of 44 days. Approximately 1000000 detections…
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Taxonomy
Topicsearthquake and tectonic studies · Seismology and Earthquake Studies · Seismic Imaging and Inversion Techniques
