Non‐double‐couple moment tensor of the March 25, 1998, Antarctic Earthquake: Composite rupture of strike‐slip and normal faults

Keiko Kuge, Masayuki Kikuchi, Yoshiko Yamanaka

doi:10.1029/1999gl005420

Non‐double‐couple moment tensor of the March 25, 1998, Antarctic Earthquake: Composite rupture of strike‐slip and normal faults

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書誌事項

公開日: 1999-11-15

権利情報

http://onlinelibrary.wiley.com/termsAndConditions#vor

DOI

10.1029/1999gl005420

公開者: American Geophysical Union (AGU)

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説明

<jats:p>The 1998 Antarctic intraplate earthquake (Mw 8.1) has a significant non‐double‐couple component in the moment tensor solution as determined from long‐period surface waves. In the teleseismic P and SH wave‐forms, there are two distinctive wave packets that can be explained by multiple strike‐slip subevents. We propose a composite rupture model comprising two different episodes: two predominant clusters of en echelon strike‐slip segments (∼16 × 10<jats:sup>20</jats:sup> Nm) and normal faulting with a long duration of approximately 100 s (∼4 × 10<jats:sup>20</jats:sup> Nm). This model agrees with observations of both teleseismic body waves and long‐period surface waves, including the large non‐double‐couple component. The normal faulting with as long a duration as the main strike‐slip rupture might be secondarily induced by the en echelon segments of strike‐slip faulting.</jats:p>