A new automatic full-waveform regional moment tensor inversion algorithm and its applications in the Taiwan Area
Journal
Bulletin of the Seismological Society of America
Journal Volume
108
Journal Issue
2
Pages
573-587
Date Issued
2018
Author(s)
Abstract
Research Article| February 13, 2018 A New Automatic Full‐Waveform Regional Moment Tensor Inversion Algorithm and Its Applications in the Taiwan Area Pei‐Ru Jian; Pei‐Ru Jian aDepartment of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, d01224005@ntu.edu.tw, tailintseng@ntu.edu.tw Search for other works by this author on: GSW Google Scholar Tai‐Lin Tseng; Tai‐Lin Tseng aDepartment of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, d01224005@ntu.edu.tw, tailintseng@ntu.edu.tw Search for other works by this author on: GSW Google Scholar Wen‐Tzong Liang; Wen‐Tzong Liang bInstitute of Earth Sciences, Academia Sinica, No. 128, Section 2, Academia Road, Taipei 11529, Taiwan, wtl@earth.sinica.edu.tw Search for other works by this author on: GSW Google Scholar Ping‐Han Huang Ping‐Han Huang cInstitute of Earth Sciences, National Taiwan Ocean University, No. 2, Beining Road, Keelung 20224, Taiwan, eric791130@gmail.com Search for other works by this author on: GSW Google Scholar Author and Article Information Pei‐Ru Jian aDepartment of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, d01224005@ntu.edu.tw, tailintseng@ntu.edu.tw Tai‐Lin Tseng aDepartment of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan, d01224005@ntu.edu.tw, tailintseng@ntu.edu.tw Wen‐Tzong Liang bInstitute of Earth Sciences, Academia Sinica, No. 128, Section 2, Academia Road, Taipei 11529, Taiwan, wtl@earth.sinica.edu.tw Ping‐Han Huang cInstitute of Earth Sciences, National Taiwan Ocean University, No. 2, Beining Road, Keelung 20224, Taiwan, eric791130@gmail.com Publisher: Seismological Society of America First Online: 13 Feb 2018 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2018) 108 (2): 573–587. https://doi.org/10.1785/0120170231 Article history First Online: 13 Feb 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Pei‐Ru Jian, Tai‐Lin Tseng, Wen‐Tzong Liang, Ping‐Han Huang; A New Automatic Full‐Waveform Regional Moment Tensor Inversion Algorithm and Its Applications in the Taiwan Area. Bulletin of the Seismological Society of America 2018;; 108 (2): 573–587. doi: https://doi.org/10.1785/0120170231 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract A new algorithm has been developed in this study that can automatically determine regional moment tensor (MT) and its centroid depth with real‐time waveforms; it can do this within 2–4 min of an earthquake notice issued by the Central Weather Bureau (CWB). The program selects 3–7 BATS (Broadband Array in Taiwan for Seismology) stations based on three different strategies: best azimuthal distribution, highest signal‐to‐noise ratio, and shortest distances. The program then inverts MT solutions in parallel with various settings that include Moho depth of velocity models, frequency bands, and isotropic constraints. The optimal solution is determined via a search for the best waveform fit with an acceptable non‐double‐couple component that comes from the results of combinations of these inversion settings. Our new rapid MT report system greatly reduces the need for computational resources and avoids human judgments. By applying this full‐scanning approach on BATS (named AutoBATS), we redetermine the MTs for over 3000 regional earthquakes that took place between 1996 and 2016, the goal being to provide the most up‐to‐date possible MT catalog for the Taiwan area. Overall, the AutoBATS MTs are consistent with the Global Centroid Moment Tensors, with a mean difference in the Kagan angle of 22.0°±16.6° and Mw of −0.08±0.10. Those focal mechanisms better illuminate the tectonic structures, which is a result of the significantly improved resolving ability for shallow (140 km) earthquakes. With the new regional MT catalog, we refine the relationship between moment and local magnitudes: Mw=0.87ML+0.23 for the Taiwan region. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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journal article