Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake. Koketsu, K., Hikima, K., Miyazaki, S., & Ide, S. Earth Planets Space, 56(3):329--334, 2004. abstract bibtex The strong motion and geodetic data were individually inverted for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake with a hypocenter 25 km deep and a fault plane above the subducting Pacific stab. Both the results show a simple slip distribution with a single major asperity, but the strong motion inversion may include a trade-off between slip location and rupture time and the geodetic inversion does not have sufficient resolution for far slips. We then carred out a joint inversion of the two datasets in order to overcome these weaknesses of the single dataset inversions. The resultant slip distribution still retains the simple pattern and has a seismic moment of 2.2 x 10(21) N(.)m (M-w 8.2). The asperity, with a peak slip of 7.1 m, is located in the center of the fault plane 50 km away from the hypocenter in the down-dip direction. The slip rate functions on subfaults around the hypocenter and asperity indicate that the rupture propagated with a supershear speed on the upper part of the fault plane and slowed down to 100-90percent of the S-wave velocity on the middle and lower parts. These simple slip patterns and near-supershear rupture may imply the maturity of the Hokkaido subduction zone around the source region.
@article{koketsu2004,
Abstract = {The strong motion and geodetic data were individually
inverted for the source
process of the 2003 Tokachi-oki, Hokkaido, earthquake with a hypocenter
25 km deep and a fault plane
above the subducting Pacific stab. Both the results show a simple slip
distribution with a single
major asperity, but the strong motion inversion may include a trade-off
between slip location and
rupture time and the geodetic inversion does not have sufficient
resolution for far slips. We then
carred out a joint inversion of the two datasets in order to overcome
these weaknesses of the single
dataset inversions. The resultant slip distribution still retains the
simple pattern and has a
seismic moment of 2.2 x 10(21) N(.)m (M-w 8.2). The asperity, with a
peak slip of 7.1 m, is located
in the center of the fault plane 50 km away from the hypocenter in the
down-dip direction. The slip
rate functions on subfaults around the hypocenter and asperity indicate
that the rupture propagated
with a supershear speed on the upper part of the fault plane and slowed
down to 100-90percent of the
S-wave velocity on the middle and lower parts. These simple slip
patterns and near-supershear
rupture may imply the maturity of the Hokkaido subduction zone around
the source region.},
Author = {Koketsu, K. and Hikima, K. and Miyazaki, S. and Ide, S.},
Date-Modified = {2010-07-12 15:13:04 -0700},
Issue = {3},
Journal = {Earth Planets Space},
Number = {3},
Pages = {329--334},
Title = {Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake},
Volume = {56},
Year = {2004},
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Both the results show a simple slip distribution with a single major asperity, but the strong motion inversion may include a trade-off between slip location and rupture time and the geodetic inversion does not have sufficient resolution for far slips. We then carred out a joint inversion of the two datasets in order to overcome these weaknesses of the single dataset inversions. The resultant slip distribution still retains the simple pattern and has a seismic moment of 2.2 x 10(21) N(.)m (M-w 8.2). The asperity, with a peak slip of 7.1 m, is located in the center of the fault plane 50 km away from the hypocenter in the down-dip direction. The slip rate functions on subfaults around the hypocenter and asperity indicate that the rupture propagated with a supershear speed on the upper part of the fault plane and slowed down to 100-90percent of the S-wave velocity on the middle and lower parts. These simple slip patterns and near-supershear rupture may imply the maturity of the Hokkaido subduction zone around the source region.","author":[{"propositions":[],"lastnames":["Koketsu"],"firstnames":["K."],"suffixes":[]},{"propositions":[],"lastnames":["Hikima"],"firstnames":["K."],"suffixes":[]},{"propositions":[],"lastnames":["Miyazaki"],"firstnames":["S."],"suffixes":[]},{"propositions":[],"lastnames":["Ide"],"firstnames":["S."],"suffixes":[]}],"date-modified":"2010-07-12 15:13:04 -0700","issue":"3","journal":"Earth Planets Space","number":"3","pages":"329--334","title":"Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake","volume":"56","year":"2004","bdsk-file-1":"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","bibtex":"@article{koketsu2004,\n\tAbstract = {The strong motion and geodetic data were individually\ninverted for the source\nprocess of the 2003 Tokachi-oki, Hokkaido, earthquake with a hypocenter\n25 km deep and a fault plane\nabove the subducting Pacific stab. Both the results show a simple slip\ndistribution with a single\nmajor asperity, but the strong motion inversion may include a trade-off\nbetween slip location and\nrupture time and the geodetic inversion does not have sufficient\nresolution for far slips. We then\ncarred out a joint inversion of the two datasets in order to overcome\nthese weaknesses of the single\ndataset inversions. The resultant slip distribution still retains the\nsimple pattern and has a\nseismic moment of 2.2 x 10(21) N(.)m (M-w 8.2). The asperity, with a\npeak slip of 7.1 m, is located\nin the center of the fault plane 50 km away from the hypocenter in the\ndown-dip direction. The slip\nrate functions on subfaults around the hypocenter and asperity indicate\nthat the rupture propagated\nwith a supershear speed on the upper part of the fault plane and slowed\ndown to 100-90percent of the\nS-wave velocity on the middle and lower parts. These simple slip\npatterns and near-supershear\nrupture may imply the maturity of the Hokkaido subduction zone around\nthe source region.},\n\tAuthor = {Koketsu, K. and Hikima, K. and Miyazaki, S. and Ide, S.},\n\tDate-Modified = {2010-07-12 15:13:04 -0700},\n\tIssue = {3},\n\tJournal = {Earth Planets Space},\n\tNumber = {3},\n\tPages = {329--334},\n\tTitle = {Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake},\n\tVolume = {56},\n\tYear = {2004},\n\tBdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QJmFydGljbGUvS29rZXRzdUhpa2ltYU1peWF6YWtpMjAwNGEucGRm0hcLGBlXTlMuZGF0YU8RAgIAAAAAAgIAAgAADE1hY2ludG9zaCBIRAAAAAAAAAAAAAAAAAAAANBcXYdIKwAAARSB4R5Lb2tldHN1SGlraW1hTWl5YXpha2kyMDA0YS5wZGYAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABFIney2qiYwAAAAAAAAAAAAEAAwAACSAAAAAAAAAAAAAAAAAAAAAHYXJ0aWNsZQAAEAAIAADQXEFnAAAAEQAIAADLapRTAAAAAQAYARSB4QEUgdwBFIF/AVWe2QAJQ2AAApPVAAIAY01hY2ludG9zaCBIRDpVc2VyczoAYmhhdDoARHJvcGJveDoAUHVibGljOgBDb2xsZWN0ZWRQYXBlcnM6AGFydGljbGU6AEtva2V0c3VIaWtpbWFNaXlhemFraTIwMDRhLnBkZgAADgA+AB4ASwBvAGsAZQB0AHMAdQBIAGkAawBpAG0AYQBNAGkAeQBhAHoAYQBrAGkAMgAwADAANABhAC4AcABkAGYADwAaAAwATQBhAGMAaQBuAHQAbwBzAGgAIABIAEQAEgBQVXNlcnMvYmhhdC9Ecm9wYm94L1B1YmxpYy9Db2xsZWN0ZWRQYXBlcnMvYXJ0aWNsZS9Lb2tldHN1SGlraW1hTWl5YXpha2kyMDA0YS5wZGYAEwABLwAAFQACAAv//wAAgAbSGxwdHlokY2xhc3NuYW1lWCRjbGFzc2VzXU5TTXV0YWJsZURhdGGjHR8gVk5TRGF0YVhOU09iamVjdNIbHCIjXE5TRGljdGlvbmFyeaIiIF8QD05TS2V5ZWRBcmNoaXZlctEmJ1Ryb290gAEACAARABoAIwAtADIANwBAAEYATQBVAGAAZwBqAGwAbgBxAHMAdQB3AIQAjgC3ALwAxALKAswC0QLcAuUC8wL3Av4DBwMMAxkDHAMuAzEDNgAAAAAAAAIBAAAAAAAAACgAAAAAAAAAAAAAAAAAAAM4}}\n\n","author_short":["Koketsu, K.","Hikima, K.","Miyazaki, S.","Ide, S."],"key":"koketsu2004","id":"koketsu2004","bibbaseid":"koketsu-hikima-miyazaki-ide-jointinversionofstrongmotionandgeodeticdataforthesourceprocessofthe2003tokachiokihokkaidoearthquake-2004","role":"author","urls":{},"downloads":0,"html":""},"search_terms":["joint","inversion","strong","motion","geodetic","data","source","process","2003","tokachi","oki","hokkaido","earthquake","koketsu","hikima","miyazaki","ide"],"keywords":[],"authorIDs":[],"dataSources":["PNGDXNYHvWreEEzYY"]}