Electronic Supplement to Rupture Directivity Analysis of the 2018 Hokkaido Eastern Iburi Earthquake and its Seismotectonic Implication by Chong Zang, Sidao Ni, Zhichao Shen This electronic supplement contains: Analysis of teleseismic waveforms for 2018 Hokkaido Eastern Iburi Earthquake; Waveform fitting for seismic stations in point source inversion; Uncertainty test for different velocity models.
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authors.library.caltech.edu · Web viewWaveform fitting for seismic stations in point source inversion. Station names, azimuths and epicentral distances are showed on the left side.
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Electronic Supplement to
Rupture Directivity Analysis of the 2018 Hokkaido Eastern Iburi
Earthquake and its Seismotectonic Implication
by Chong Zang, Sidao Ni, Zhichao Shen
This electronic supplement contains: Analysis of teleseismic waveforms for 2018 Hokkaido
Eastern Iburi Earthquake; Waveform fitting for seismic stations in point source inversion;
Uncertainty test for different velocity models.
List of Figure Captions
Figure S1. Analysis of teleseismic waveforms. (a) Comparison of observations with synthetics.
The broadband vertical component displacement waveforms are showed here. For synthetics, the
centroid depth and double-couple focal mechanism come from gCMT. (b) Velocity model used to
generate the synthetics. Black: for eastern stations. Red: for western stations. (c) Comparison of
individual phases (P, pP, sP; red line) with full wave field (black dashed line) by wavefield
decomposition. For each phase, the energies of other phases are compressed. The theoretical
arrival time of P, pP and sP are marked by blue dashed line.
Figure S2. Waveform fitting for seismic stations in point source inversion. Station names,
azimuths and epicentral distances are showed on the left side. Cross-correlation coefficients and
time shifts are showed on the right side. Black and red traces are observed and synthetic
seismograms, respectively.
Figure S3. Uncertainty test for different velocity models. (a) Three velocity models tested in this
study. Black: the crust1.0 model without sediment (Eastern model). Red: the crust1.0 model with
sediment (Western model). Blue: the crust2.0 model. (b) Point source inversion results for
different velocity models. (c) Rupture directivity analysis results for different velocity models.
Rupture models are marked with various symbols (Circle: NP1-model; Star: NP2-model; Triangle:
Point source model). Color of the symbols correspond to the above three velocity models. The
black dashed lines show results in this study.
Figure S1. Analysis of teleseismic waveforms. (a) Comparison of observations with synthetics.
The broadband vertical component displacement waveforms are showed here. For synthetics, the
centroid depth and double-couple focal mechanism come from gCMT. (b) Velocity model used to
generate the synthetics. Black: for eastern stations. Red: for western stations. (c) Comparison of
individual phases (P, pP, sP; red line) with full wave field (black dashed line) by wavefield
decomposition. For each phase, the energies of other phases are compressed. The theoretical
arrival time of P, pP and sP are marked by blue dashed line.
Figure S2. Waveform fitting in point source inversion. Station names, azimuths and epicentral
distances are showed on the left side. Cross-correlation coefficients and time shifts are showed on
the right side. Black and red traces are observed and synthetic seismograms, respectively.
Figure S3. Uncertainty test for different velocity models. (a) Three velocity models tested in this
study. Black: the crust1.0 model without sediment (Eastern model). Red: the crust1.0 model with
sediment (Western model). Blue: the crust2.0 model. (b) Point source inversion results for
different velocity models. (c) Rupture directivity analysis results for different velocity models.
Rupture models are marked with various symbols (Circle: NP1-model; Star: NP2-model; Triangle:
Point source model). Color of the symbols correspond to the above three velocity models. The