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The 2010 Mw 7.8 Mentawai earthquake : very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data

หน่วยงาน Nanyang Technological University, Singapore

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ชื่อเรื่อง : The 2010 Mw 7.8 Mentawai earthquake : very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data
นักวิจัย : Hill, Emma M. , Borrero, José C. , Huang, Zhenhua , Qiu, Qiang , Banerjee, Paramesh , Natawidjaja, Danny H. , Elosegui, Pedro , Fritz, Hermann M. , Suwargadi, Bambang W. , Pranantyo, Ignatius Ryan , Li, Linlin , Macpherson, Kenneth A. , Skanavis, Vassilis , Synolakis, Costas E. , Sieh, Kerry
คำค้น : DRNTU::Science::Geology::Volcanoes and earthquakes.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Hill, E. M., Borrero, J. C., Huang, Z., Qiu, Q., Banerjee, P., Natawidjaja, D. H., et al. (2012). The 2010 Mw 7.8 Mentawai earthquake : very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data. Journal of Geophysical Research, 117, B06402 , 0148-0227 , http://hdl.handle.net/10220/8666 , http://dx.doi.org/10.1029/2012JB009159
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of geophysical research
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

The Mw 7.8 October 2010 Mentawai, Indonesia, earthquake was a “tsunami earthquake,” a rare type of earthquake that generates a tsunami much larger than expected based on the seismicmagnitude. It produced a locally devastating tsunami, with runup commonly in excess of 6 m. We examine this event using a combination of high-rate GPS data, from instruments located on the nearby islands, and a tsunami field survey. The GPS displacement time series are deficient in high-frequency energy, and show small coseismic displacements (<22 cm horizontal and <4 cm subsidence). The field survey shows that maximum tsunami runup was >16 m. Our modeling results show that the combination of the small GPS displacements and large tsunami can only be explained by high fault slip at very shallow depths, far from the islands and close to the oceanic trench. Inelastic uplift of trench sediments likely contributed to the size of the tsunami. Recent results for the 2011 Mw 9.0 Tohoko-Oki earthquake have also shown shallow fault slip, but the results from our study, which involves a smaller earthquake, provide much stronger constraints on how shallow the rupture can be, with the majority of slip for the Mentawai earthquake occurring at depths of <6 km. This result challenges the conventional wisdom that the shallow tips of subduction megathrusts are aseismic, and therefore raises important questions both about the mechanical properties of the shallow fault zone and the potential seismic and tsunami hazard of this shallow region.

บรรณานุกรม :
Hill, Emma M. , Borrero, José C. , Huang, Zhenhua , Qiu, Qiang , Banerjee, Paramesh , Natawidjaja, Danny H. , Elosegui, Pedro , Fritz, Hermann M. , Suwargadi, Bambang W. , Pranantyo, Ignatius Ryan , Li, Linlin , Macpherson, Kenneth A. , Skanavis, Vassilis , Synolakis, Costas E. , Sieh, Kerry . (2555). The 2010 Mw 7.8 Mentawai earthquake : very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Hill, Emma M. , Borrero, José C. , Huang, Zhenhua , Qiu, Qiang , Banerjee, Paramesh , Natawidjaja, Danny H. , Elosegui, Pedro , Fritz, Hermann M. , Suwargadi, Bambang W. , Pranantyo, Ignatius Ryan , Li, Linlin , Macpherson, Kenneth A. , Skanavis, Vassilis , Synolakis, Costas E. , Sieh, Kerry . 2555. "The 2010 Mw 7.8 Mentawai earthquake : very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Hill, Emma M. , Borrero, José C. , Huang, Zhenhua , Qiu, Qiang , Banerjee, Paramesh , Natawidjaja, Danny H. , Elosegui, Pedro , Fritz, Hermann M. , Suwargadi, Bambang W. , Pranantyo, Ignatius Ryan , Li, Linlin , Macpherson, Kenneth A. , Skanavis, Vassilis , Synolakis, Costas E. , Sieh, Kerry . "The 2010 Mw 7.8 Mentawai earthquake : very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Hill, Emma M. , Borrero, José C. , Huang, Zhenhua , Qiu, Qiang , Banerjee, Paramesh , Natawidjaja, Danny H. , Elosegui, Pedro , Fritz, Hermann M. , Suwargadi, Bambang W. , Pranantyo, Ignatius Ryan , Li, Linlin , Macpherson, Kenneth A. , Skanavis, Vassilis , Synolakis, Costas E. , Sieh, Kerry . The 2010 Mw 7.8 Mentawai earthquake : very shallow source of a rare tsunami earthquake determined from tsunami field survey and near-field GPS data. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.