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A MATLAB GUI for Examining Triggered Tremor: A Case Study in New Zealand

Chao, Kevin and Yu, Chunquan (2018) A MATLAB GUI for Examining Triggered Tremor: A Case Study in New Zealand. Seismological Research Letters, 89 (6). pp. 2362-2373. ISSN 0895-0695. doi:10.1785/0220180057.

[img] Archive (ZIP) (Table of teleseismic earthquakes information and seismograms for all observed tremor‐triggering events; figures showing observations of triggered tremor, observed dynamic stress versus back azimuth; and example of examination of triggered earthquakes...) - Supplemental Material
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We introduce a user‐friendly MATLAB GUI (graphical user interface) software for searching for triggered tectonic tremor. This software includes the following features: (1) multiple panels, whose primary function screen shows seismograms filtered at various frequency bands, surface‐wave seismograms or spectrograms for comparison, and a station map; (2) a tag function with which users can classify each station by quality and/or group and whose results will show on the map; (3) the locations of tremor sources from which users can manually pick the arrival times of individual tremor bursts and quickly obtain preliminary locations; and (4) output visualization from which users can align triggered tremor as a move‐out plot or save snapshots to a PDF file. For demonstration, we apply this package to examine triggered tremor in New Zealand between 2004 and 2016. We analyze 5300 seismograms from 18 M_w ≥ 7.5 target earthquakes and find that 9 generate triggered tremors in six regions in the central and the northern Hikurangi subduction margin, the central strike‐slip Alpine fault, Kaikōura and Southland in the South Island, and Northland in the North Island. The minimum apparent tremor‐triggering stress observed at the surface stations in these regions varies from 5.0 to 16.6 kPa. This GUI‐based package can facilitate the process of analysis for identifying triggered seismic events from a sizeable seismic dataset.

Item Type:Article
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Yu, Chunquan0000-0001-8681-8572
Additional Information:© 2018 Seismological Society of America. Published Online 5 September 2018. Data and Resources: To download CrazyTremor and view online tutorials, users can visit the following website: The seismic data used in this article were obtained from GeoNet at The digital files of active faults in New Zealand can be obtained at The commercial platform, MATLAB, is from Mathworks, available at An online tutorial of “A student’s guide on examining remotely triggered seismicity from waveform data” can be accessed at (Peng, 2014). A MATLAB script to download the Incorporated Research Institutions for Seismology (IRIS) seismic data archive can be found at All websites were last accessed on August 2018. The authors thank Editor Zhigang Peng, Reviewers Calum J. Chamberlain and Suguru Yabe, and an anonymous reviewer for their thoughtful comments for further improving the article. The authors acknowledge the New Zealand GeoNet project and its sponsors—EQC, GNS Science, and LINZ—for providing the data and images used in this study. K. Chao is supported by the Northwestern Institute for Complex Systems and the Center for Optimization and Statistical Learning at Northwestern University through the Northwestern Data Science Scholars Fellowship.
Group:Seismological Laboratory
Funding AgencyGrant Number
Northwestern UniversityUNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20180905-145244235
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Official Citation:Kevin Chao, Chunquan Yu; A MATLAB GUI for Examining Triggered Tremor: A Case Study in New Zealand. Seismological Research Letters ; 89 (6): 2362–2373. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89402
Deposited By: Tony Diaz
Deposited On:06 Sep 2018 16:42
Last Modified:16 Nov 2021 00:35

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