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Published November 1, 2015 | Supplemental Material + Published
Journal Article Open

Numerical earthquake models of the 2013 Nantou, Taiwan, earthquake series: Characteristics of source rupture processes, strong ground motions and their tectonic implication

Abstract

On 27 March and 2 June 2013, two large earthquakes with magnitudes of ML 6.2 and ML 6.5, named the Nantou earthquake series, struck central Taiwan. These two events were located at depths of 15–20 km, which implied that the mid-crust of central Taiwan is an active seismogenic area even though the subsurface structures have not been well established. To determine the origins of the Nantou earthquake series, we investigated both the rupture processes and seismic wave propagations by employing inverse and forward numerical simulation techniques. Source inversion results indicated that one event ruptured from middle to shallow crust in the northwest direction, while the other ruptured towards the southwest. Simulations of 3-D wave propagation showed that the rupture characteristics of the two events result in distinct directivity effects with different amplified shaking patterns. From the results of numerical earthquake modeling, we deduced that the occurrence of the Nantou earthquake series may be related to stress release from the easternmost edge of a preexistent strong basement in central Taiwan.

Additional Information

© 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Received 4 March 2015; Received in revised form 11 June 2015; Accepted 30 June 2015; Available online 2 July 2015. The Real-time strong motion data (RTD) for this paper are available at Taiwan Rapid Earthquake Information Release System implemented by the Central Weather Bureau. The teleseismic data used was obtained from Incorporated Research Institutions for Seismology (IRIS). The GPS coseismic displacements are available at TEC GPS Lab (http://gps.earth.sinica.edu.tw). Our research was supported by Academia Sinica funded through the Taiwan Numerical Earthquake Model (TNEM) project, Grant Number 102-Investigator Award-02. This research was also supported by the Taiwan Earthquake Research Center funded through the Ministry of Science and Technology by Grant Number MOST 103-2628-M-001-004-MY3. The TEC contribution number for this article is 00115.

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