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Source parameters of the May 2, 2009 Andong earthquake in South Korea

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Abstract

An earthquake occurred in the Andong area, South Korea on May 2, 2009. Korea Meteorological Administration reported its magnitude and epicenter to be ML 4.0 and (36.56°N, 128.71°E), respectively. We carried out the waveform inversion analysis to estimate source parameters of the event. The seismic moment was estimated to be 3.8 × 1014 N·m (MW 3.7). The focal mechanism is strike-slip faulting including a little weak thrust component. The direction of P-axis of the event is N70°E which is similar to the other studies on the direction of P-axis in and around the Korean Peninsula. From the spectral analysis, the moment magnitude was estimated to be MW 3.7, which coincides with that by the waveform inversion analysis. The average stress drop is estimated to be 6.5 MPa. We applied the double difference event location method with 4 events of the Andong earthquake sequence and one event on April 28, 2010. Considering nearby Andong fault systems, location results by double difference and single event location method, and focal mechanisms, the direction of causative fault may be NW-SE or WNW-ESE.

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Author notes

  1. Hoseon Choi

    Present address: Structural Systems and Site Evaluation Department, Korea Institute of Nuclear Safety, Daejeon, 305-338, Republic of Korea

Authors and Affiliations

  1. School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-747, Republic of Korea

    Hoseon Choi

  2. Structural Systems and Site Evaluation Department, Korea Institute of Nuclear Safety, Daejeon, 305-338, Republic of Korea

    Myunghyun Noh

Authors
  1. Hoseon Choi
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  2. Myunghyun Noh
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Correspondence to Hoseon Choi.

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Choi, H., Noh, M. Source parameters of the May 2, 2009 Andong earthquake in South Korea. Geosci J 14, 269–276 (2010). https://doi.org/10.1007/s12303-010-0025-1

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  • DOI: https://doi.org/10.1007/s12303-010-0025-1

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