Rupture process of the 2010 M w 7.8 Mentawai tsunami earthquake from joint inversion of near-field hr-gps and
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1 Rupture process of the 2010 M w 7.8 Mentawai tsunami earthquake from joint inversion of near-field hr-gps and teleseismic body wave recordings constrained by tsunami observations Han Yue 1, Thorne Lay 1, Luis Rivera 2, Yefei Bai 3, Yoshiki Yamazaki 3, Kwok Fai Cheung 3, Emma M. Hill 4, Kerry Sieh 4, Widjo Kongko 5, and Abdul Muhari 6 1. Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, USA 2. Institut de Physique du Globe de Strasbourg, Université de Strasbourg/CNRS, Strasbourg, France 3. Department of Ocean and Resources Engineering, University of Hawaii at Manoa, Honolulu, HI, USA 4. Earth Observatory of Singapore, Nanyang Technological University, Singapore 5. Coastal Dynamic Research Center, Badan Pengkajan dan Penerapan Teknologi (BPPT), Jogjakarta 55281, Indonesia 6. International Research Institute of Disaster Science, Tohoku University, Sendai, Japan Supporting Materials 1. Fig. S1. Observed (red) and modeled (black) ground displacement signals for all teleseismic P-waves and S-waves for the preferred joint inversion. Teleseismic records are ordered by azimuth. 2. Fig. S2. Slip distribution of rupture models inverted with dynamic and static regional displacement observations. From left to right, each column presents inversion results inverted with velocity waveforms with the whole fault plane, velocity waveforms with the truncated fault plane, static displacement with the whole fault plane, static displacement with truncated fault plane, respectively. From top to bottom, each row presents results of smoothing factor selected as 0.1,0.2,0.5 and 1.0. In each panel, the hypocenter location is presented with a red filled star with color scale marked on the right. 3. Velocity_model.pdf list the 1- D layered model parameters for the local structure used for computing both the teleseismic Green functions and the regional hr- GPS complete ground motion Green functions. 1
2 4. FFM_model.txt list the model parameters for the preferred finite fault model of the 2010 Mentawai earthquake obtained by joint inversion of the hr- GPS and teleseismic P and SH waves with iterative modeling of the tsunami signals. Each row indicates the subfault initial rupture time, total rupture duration, grid center position (lat/long/depth), strike/dip/rake, seismic moment, slip, and fault plane grid position x/y. The hypocenter is at x position km, y position 60 km. 5. Movie1.mov is a QuickTime movie (.mov) showing an animation of the tsunami surface water level spreading through the source region and out to beyond the recording sites at Cocos Island and DART buoy The time increment is 1 minute, with the total lapse time given by hr:min after the hypocentral time. 6. Movie2.mov is a QuickTime movie (.mov) showing an animation of the tsunami surface water level spreading through the local source region and penetrating through the Mentawai Islands to impinge on the Sumatran coast. The positions of the GPS buoy and the tide- gauge recording at Padang are indicated. The time increments is 30 seconds, with the total lapse time given by hr:min:sec after the hypocentral time. 2
3 Fig S1. Observed (red) and modeled (black) ground displacement signals for all teleseismic P-waves and S-waves for the preferred joint inversion. Teleseismic records are ordered by azimuth. 3
4 Fig S2. Slip distribution of rupture models inverted with dynamic and static regional displacement observations. From left to right, each column presents inversion results inverted with velocity waveforms with the whole fault plane, velocity waveforms with the truncated fault plane, static displacement with the whole fault plane, static displacement with truncated fault plane, respectively. From top to bottom, each row presents results of smoothing factor selected as 0.1,0.2,0.5 and 1.0. In each panel, the hypocenter location is presented with a red filled star with color scale marked on the right. 4
5 Velocity Model Source side structure Vp(km/s) Vs(km/s) Density(g/cm^2) Thickness (km) Receiver side strucutre Vp(km/s) Vs(km/s) Density(g/cm^2) Thickness (km)
6 Mentawai event 2010/10/25 Mag:7.80 FFM inverted from hr-gps/teleseismic and constrained by Tsunami modeling Green Functions for local 1-D model Initial time at 14:42:22 Hypocenter at N, E, km Node locate at the center of each subfault < Subevent sequence > time time-dur lat lon depth strike dip rake Mo(Nm) slip(m) x y segnum subnum parnum e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e
7 e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e
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