Seismic deformation of the Mw 8.0 Wenchuan earthquake from high-rate GPS observations

Shi, Chuang; Lou, Yidong; Zhang, H.; Zhao, Qile; Geng, Jianghui; Wang, R.; Fang, Rongxin; Liu, J.

doi:10.1016/j.asr.2010.03.006

Cited by 85 publications

(43 citation statements)

References 31 publications

(31 reference statements)

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“…In recent years, 1-Hz GPS observations have been used to determine the short-period surface displacements and successfully measured seismic motions induced by the 2002 Denali fault earthquake Bock et al, 2004;Bilich et al, 2008), the 2003 Tokachi-oki earthquake (Koyama et al, 2004;Miyazaki et al, 2004), the 2004 Sumatra-Andaman earthquake (Ohta et al, 2006), and the 2008 Wenchuan earthquake (Shi et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of very-high-rate GPS observations for seismology

Ebinuma

Kato

2012

Earth Planet Sp

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GPS observations with higher than once-per-second sampling are becoming increasingly important for seismology. A number of reports have shown that very-high-rate GPS receivers are capable of capturing dynamic ground displacements from significant earthquakes. The higher output rate, however, does not necessarily mean higher frequency content of the corresponding observations. In order to examine dynamic effects on very-highrate GPS observations, the frequency response characteristics of several geodetic GPS receivers were evaluated using a GPS signal simulator in controlled laboratory conditions. The tested receivers include Trimble Net-R8, NovAtel OEMV, and TOPCON Net-G3A. The experiment results suggest that the dynamic characteristics of the signal tracking loops put a limit on the frequency of the received signals, and all the tested receivers except for Trimble show good signal tracking performance at up to 5 Hz under dynamic stress of 2 G acceleration. The power spectral densities of the kinematic solutions obtained from the simulated seismic motion of the 2008 Iwate-Miyagi Inland earthquake (M w 6.8) are also evaluated. The power spectral densities of both the NovAtel and TOPCON receivers agree with the simulated ground displacement at up to 5 Hz. By contrast, the Trimble receiver provides a pronounced increase in spectral energy above 2 Hz.

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Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of very-high-rate GPS observations for seismology

Ebinuma

Kato

2012

Earth Planet Sp

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“…This demonstrates that the 1 Hz sampling frequency (Nyquist frequency of 0.5 Hz or 2 s) is the limiting factor for the period range of observation in this case. Although the Tohoku-Oki event is not covered by our modeling hypotheses, other earthquakes have been well recorded by high-rate GPS (Miyazaki et al, 2004;Bilich et al, 2008;Larson and Miyazaki, 2008;Yokota et al, 2009;Delouis et al, 2010;Shi et al, 2010;Allen and Ziv, 2011;Avallone et al, 2011;Houlié et al, 2011Houlié et al, , 2014Lay et al, 2011;Yue and Lay, 2011;Mitsui and Heki, 2012;Zheng et al, 2012;Kelevitz et al, 2017). A case study is presented in the Observations from the 2008 IwateMiyagi Nairiku Earthquake section.…”

Section: Gps Noise Levels Noise Of Real-time Gps-ppp Time Series Is mentioning

confidence: 99%

The Potential of High‐Rate GPS for Strong Ground Motion Assessment

Michel¹,

Kelevitz²,

Houlié³

et al. 2017

Bulletin of the Seismological Society of America

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We show that high-rate Global Positioning System (GPS) can have a vital role to play in near-real-time monitoring of potentially destructive earthquakes. We do this by investigating the potential of GPS in recording strong ground motions from earthquakes in Switzerland and Japan. The study uses finite-fault stochastic groundmotion simulation based on Fourier amplitude spectra and duration models previously developed for both countries, allowing comparisons in terms of both Fourier and timedomain characteristics (here, the peak ground velocity [PGV]).We find that earthquakes of magnitude M w > 5:8 can be recorded by GPS in real time at 10 km distance, that is, their Fourier spectrum exceeds the noise of the instruments enough to be used in strong-motion seismology. Postprocessing of GPS time series lowers the noise and can improve the minimum observable magnitude by 0.1-0.2. As GPS receivers can record at higher rates (> 10 Hz), we investigate which sampling rate is sufficient to optimally record earthquake signals and conclude that a minimum sampling rate of 5 Hz is recommended. This is driven by recording events at short distances (below 10 km for magnitude 6 events and below 30 km for magnitude 7 events).Furthermore, the maximum ground velocity derived from GPS is compared with the actual PGV for synthetic signals from the stochastic simulations and the 2008 M w 6.9 Iwate earthquake. The proposed model, confirmed by synthetic and empirical data, shows that a reliable estimate of PGV for events of about magnitude 7 and greater can be basically retrieved by GPS in real time and could be included, for instance, in ShakeMaps for aiding postevent disaster management.

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“…These observations detect strong signals such as S wave and surface waves (Kouba, 2003;Larson et al, 2003;Irwan et al, 2004;Ohta et al, 2006;Wang et al, 2007;Davis and Smalley, 2009;Shi et al, 2010), as well as relatively weaker seismic phases such as P waves (Avallone et al, 2011). Seismic phases arriving later than surface waves have been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

“…High-rate Global Positioning Systems (GPS) observations can record ground motions from moderate to strong earthquakes at distances of a few kilometers up to thousands of kilometers (Larson et al, 2003;Bock et al, 2004;Ohta et al, 2006;Wang et al, 2007;Davis and Smalley, 2009;Delouis et al, 2010;Shi et al, 2010;Yue and Lay, 2011). These observations detect strong signals such as S wave and surface waves (Kouba, 2003;Larson et al, 2003;Irwan et al, 2004;Ohta et al, 2006;Wang et al, 2007;Davis and Smalley, 2009;Shi et al, 2010), as well as relatively weaker seismic phases such as P waves (Avallone et al, 2011).…”

Section: Introductionmentioning

confidence: 99%