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dc.contributor.author
Hobiger, Manuel
dc.contributor.author
Wegler, Ulrich
dc.contributor.author
Shiomi, Katsuhiko
dc.contributor.author
Nakahara, Hisashi
dc.contributor.author
Yoshimoto, Kazuo
dc.date.accessioned
2018-01-29T09:17:32Z
dc.date.available
2018-01-26T19:37:12Z
dc.date.available
2018-01-29T09:17:32Z
dc.date.issued
2017-08-02
dc.identifier.uri
http://hdl.handle.net/20.500.11850/235572
dc.description.abstract
Using Passive Image Interferometry (PII), we analyze long time series of seismic noise data from Hi-net seismometers in the Kanto Basin in and around Tokyo. The 17 deep borehole seismometers used in this study are located in depths between 1200 and 3500 m below the Earth's surface. The analyzed time series span 9.5 years (January 2003 to June 2012) and include the recordings of the MW 9.0 Tohoku-oki earthquake on 2011 March 11 and also an M 5.7 earthquake in Southern Ibaraki prefecture on 2004 October 6. Single-station cross-correlations and cross-correlations were calculated for the different stations and station pairs, respectively, in frequency ranges between 0.125 and 4.0 Hz. Significant coseismic velocity drops are observed, followed by postseismic recovery that can be modeled by an exponential function. Using the frequency-dependence of the velocity changes, we can constrain the depth range of the observed velocity changes. Furthermore, we correlate the observed velocity changes with the pga and pgv values at the respective sites. As this study uses very deep sensors compared with previous studies, we anticipate that the observed noise field differs from the one observed at surface stations. Consequently, the depth range of the observed coseismic velocity changes can be constrained more precisely combining the results of this study with previous results.
en_US
dc.language.iso
en
en_US
dc.title
Observation of coseismic and postseismic velocity changes for deep borehole seismic stations in the Kanto area
en_US
dc.type
Other Conference Item
ethz.event
Joint Scientific Assembly of the IAG and IASPEI 2017
en_US
ethz.event.location
Kobe, Japan
en_US
ethz.event.date
July 30 - August 4, 2017
en_US
ethz.notes
Conference Lecture on August 2, 2017 in Session S03-5: Imaging of heterogeneities in the Earth with seismic scattered waves and ambient noise V.
en_US
ethz.publication.status
unpublished
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00003 - Schulleitung und Dienste::00022 - Bereich VP Forschung & Wirtschaftsbez. / Domain VP Research & Corporate Relations::02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00003 - Schulleitung und Dienste::00022 - Bereich VP Forschung & Wirtschaftsbez. / Domain VP Research & Corporate Relations::02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
en_US
ethz.date.deposited
2018-01-26T19:37:13Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2018-01-29T09:17:37Z
ethz.rosetta.lastUpdated
2018-11-06T07:32:20Z
ethz.rosetta.versionExported
true
ethz.COinS
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