Jurnal

Focal mechanism of the August 18th 2012 Mw6.3 Palu-Koro earthquake and its implication of seismic hazard

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The Palu-Koro fault is a left-lateral strike-slip fault in Sulawesi within the active triple
junction generated by the ongoing fast convergence of the Pacific-Philippine plate, the Indo-
Australian plate and the Sunda plate. There are densely populated areas that are susceptible to
earthquakes occur along the fault, and the August 18th 2012, Mw6.3 earthquake is one of such
events. To better understand this earthquake and the seismic hazard in the region, we
estimated source parameters of this earthquake using the Cut and Paste (CAP) inversion
method with regional broadband waveform data. Our results show that the best solution of
this event is 339o, 71o, -16o
and 11 km for strike, dip, rake and centroid depth, respectively.
Inversions using stations within different distance ranges, i.e. 0-5 o, 0-10o and 0-20o, reveal
consistent solutions, suggesting the robustness of our result, which is also in agreement with
that from the other agencies, i.e. USGS and Global CMT. We further verify the centroid depth
by modeling the depth phases recorded at the teleseismic distance, which also confirm the
depth of 11km. Finally we analyzed the Coulomb stress caused by this earthquake and
historical events to investigate the interaction between the earthquakes in the region. Our
results indicate that more than 70% of the 2012 aftershocks are distributed in the positive
Coulomb stress increased zones. Our analysis also shows that the unclamping effect from the
1996 Mw7.9 megathrust in the Minahassa Trench promoted the occurrence of the 2012
Mw6.3 event. High slip-rate across the fault and Coulomb stress analysis suggest that more
attention should be paid to the segments along the Palu-Koro fault that did not rupture in the
previous earthquake circle

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

551.22 KHA f

Penerbit

: ., 0

Deskripsi Fisik

7 hal;ilusi;30 cm

Bahasa

English

ISBN/ISSN

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Klasifikasi

551.22 KHA f

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

Focal Mechanism, Cut and Paste, Coloumb Stress, Un

Info Detail Spesifik

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Pernyataan Tanggungjawab

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