Resolving static offsets from high-rate GPS data: the 2003 Tokachi-oki earthquake

The Mw 8.0 2003 Tokachi-oki earthquake offshore Hokkaido is the largest earthquake observed to date by a dense GPS network (GEONET). These GPS data are important both for resolving the geodetic signature of the earthquake itself and studies of postseismic deformation. Because GPS positions are generally estimated by averaging 24 hours of observations, it can be difficult to separate the effects of the earthquake and early postseismic deformation. In order to address this difficulty, a Kalman filtering methodology is developed that allows the estimation of the static offsets for the mainshock, its largest aftershock, and postseismic deformation in the first 24 hours. The static offsets computed for this study can be used for earthquake rupture studies while the early postseismic data can be used to evaluate frictional properties of the fault.

[1]  Isao Naito,et al.  An impact of estimating tropospheric delay gradients on precise positioning in the summer using the Japanese nationwide GPS array , 2003 .

[2]  Robert W. Graves,et al.  Resolution analysis of finite fault source inversion using one- and three-dimensional Green's functions: 2. Combining seismic and geodetic data , 2001 .

[3]  S. Miyazaki,et al.  Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake , 2004 .

[4]  Yuki Hatanaka,et al.  Calibration of antenna-radome and monument-multipath effect of GEONET—Part 1: Measurement of phase characteristics , 2001 .

[5]  Penina Axelrad,et al.  Improving the precision of high-rate GPS , 2007 .

[6]  Paul Bodin,et al.  Using 1-Hz GPS Data to Measure Deformations Caused by the Denali Fault Earthquake , 2003, Science.

[7]  G. Blewitt.  Carrier Phase Ambiguity Resolution for the Global Positioning System Applied to Geodetic Baselines up to 2000 km , 1989 .

[8]  Kyuhong Choi.  Improvements in GPS precision: 10 Hz to one day , 2007 .

[9]  Makoto Murakami,et al.  Coseismic and postseismic crustal deformation after the Mw 8 Tokachi-oki earthquake in Japan , 2004 .

[10]  Kristine M. Larson,et al.  Coseismic and early postseismic slip for the 2003 Tokachi‐oki earthquake sequence inferred from GPS data , 2008 .

[11]  Chen Ji,et al.  Preliminary Report on the 28 September 2004, M 6.0 Parkfield, California Earthquake , 2005 .

[12]  Stephen M. Lichten,et al.  Strategies for high-precision Global Positioning System orbit determination , 1987 .

[13]  M. Kikuchi,et al.  Source process of the recurrent Tokachi-oki earthquake on September 26, 2003, inferred from teleseismic body waves , 2003 .

[14]  Zuheir Altamimi,et al.  ITRF2000: A new release of the International Terrestrial Reference Frame for earth science applications , 2002 .

[15]  A. Niell.  Global mapping functions for the atmosphere delay at radio wavelengths , 1996 .

[16]  A. Hasegawa,et al.  The 2003 M8.0 Tokachi‐Oki earthquake – How much has the great event paid back slip debts? , 2004 .

[17]  Paul Segall,et al.  Volcano monitoring using the Global Positioning System: Filtering strategies , 2001 .

[18]  Paul Segall,et al.  Space time distribution of afterslip following the 2003 Tokachi‐oki earthquake: Implications for variations in fault zone frictional properties , 2004 .

[19]  Kristine M. Larson,et al.  Modeling the rupture process of the 2003 September 25 Tokachi‐Oki (Hokkaido) earthquake using 1‐Hz GPS data , 2004 .

[20]  Paul Segall,et al.  Time dependent inversion of geodetic data , 1997 .