TY - JOUR

T1 - Estimate of tsunami source using optimized unit sources and including dispersion effects during tsunami propagation

T2 - The 2012 Haida Gwaii earthquake

AU - Gusman, Aditya Riadi

AU - Mulia, Iyan Eka

AU - Satake, Kenji

AU - Watada, Shingo

AU - Heidarzadeh, Mohammad

AU - Sheehan, Anne F.

N1 - Publisher Copyright:
©2016. American Geophysical Union. All Rights Reserved.

PY - 2016/9/28

Y1 - 2016/9/28

N2 - We apply a genetic algorithm to find the optimized unit sources using dispersive tsunami synthetics to estimate the tsunami source of the 2012 Haida Gwaii earthquake. The optimal number and distribution of unit sources gives the sea surface elevation similar to that from our previous slip distribution on a fault using tsunami data, but different from that using seismic data. The difference is possibly due to submarine mass failure in the source region. Dispersion effects during tsunami propagation reduce the maximum amplitudes by up to 20% of conventional linear longwave propagation model. Dispersion effects also increase tsunami travel time by approximately 1 min per 1300 km on average. The dispersion effects on amplitudes depend on the azimuth from the tsunami source reflecting the directivity of tsunami source, while the effects on travel times depend only on the distance from the source.

AB - We apply a genetic algorithm to find the optimized unit sources using dispersive tsunami synthetics to estimate the tsunami source of the 2012 Haida Gwaii earthquake. The optimal number and distribution of unit sources gives the sea surface elevation similar to that from our previous slip distribution on a fault using tsunami data, but different from that using seismic data. The difference is possibly due to submarine mass failure in the source region. Dispersion effects during tsunami propagation reduce the maximum amplitudes by up to 20% of conventional linear longwave propagation model. Dispersion effects also increase tsunami travel time by approximately 1 min per 1300 km on average. The dispersion effects on amplitudes depend on the azimuth from the tsunami source reflecting the directivity of tsunami source, while the effects on travel times depend only on the distance from the source.

KW - directivity of tsunami source

KW - dispersion effect

KW - genetic algorithm

KW - optimized source model

KW - submarine mass failure

KW - the 2012 Haida Gwaii earthquake

UR - http://www.scopus.com/inward/record.url?scp=84988807132&partnerID=8YFLogxK

U2 - 10.1002/2016GL070140

DO - 10.1002/2016GL070140

M3 - Article

AN - SCOPUS:84988807132

SN - 0094-8276

VL - 43

SP - 9819

EP - 9828

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 18

ER -