Identification of Strong Motion Generation Area of the 2019 Hualien Earthquake

Saurabh Sharma, A. Joshi, S. Singh, C. M. Lin, C. H. Kuo, K. L. Wen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Strong motion generation areas are the extended areas with large uniform slip velocity within the entire rupture plane. The high-frequency ground motion due to these areas need to be studied to model the contribution of stress released with respect to the entire rupture plane. The study presented in this paper examines the high frequency ground motion resulting from the strong motion generation area (SMGA) located within the entire rupture plane that caused the Hualien earthquake. The eastern coast of Taiwan was hit by a strong earthquake of Mw (6.2) on April 18, 2019. The seismic activity of this earthquake was recorded by 107 stations of the Central Weather Bureau (CWB) around entire Taiwan region. The epicentral distance of stations recording this earthquake varies from 5 to 242 km. A total of 10 near-field stations have been used to investigate the source characteristics of this earthquake. The records from these near-field stations show the presence of two prominent phases in the horizontal components. These prominent phases have been termed as SMGA and are the source of high-frequency radiations (Miyake et al in Bull Seismol Soc Am 93(6):2531–2545 2003, [6]). The SH component obtained by the horizontal components has been numerically integrated to find the size of SMGAs. The displacement record obtained clearly shows the presence of two SMGAs. The seismic moment (Mo) related to these SMGAs is (3.60 ± 0.82) × 1017 Nm and (4.55 ± 0.7) × 1017 Nm, respectively.

Original languageEnglish
Title of host publicationProceedings of 17th Symposium on Earthquake Engineering (Vol. 4)
EditorsManish Shrikhande, Pankaj Agarwal, P.C. Ashwin Kumar
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages13
ISBN (Print)9789819914586
StatePublished - 2023
Event17th International Symposium on Earthquake Engineering, SEE 2022 - Roorkee, India
Duration: 14 Nov 202217 Nov 2022

Publication series

NameLecture Notes in Civil Engineering
Volume332 LNCE
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


Conference17th International Symposium on Earthquake Engineering, SEE 2022


  • 2019 Hualien earthquake
  • Source parameters
  • Strong motion generation area


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