Sudden drop of seismic velocity after the 2004 Mw 6.6 mid-Niigata earthquake, Japan, observed with Passive Image Interferometry

[1] Passive Image Interferometry (PII) is a seismological method employing ambient seismic noise to monitor the temporal evolution of mean shear wave velocity within the Earth. First, the elastic Green's tensor between two seismometers is computed from the cross correlation of seismic noise recorded during a certain period. Second, the constructed seismograms of different time periods are treated as earthquake multiplets, and small time shifts in their coda are used to invert a relative change in mean shear wave velocity. When applied to the source region of the 2004 Mw = 6.6 mid-Niigata earthquake, Japan (centroid depth 5 km), we used noise recorded at six seismometers located at a distance of less than 25 km from the epicenter. Daily inversions during the 2 months before and after the earthquake show a sudden drop of mean shear wave velocity of some tenths of a percent at the time of the mid-Niigata earthquake. Using noise in two frequency bands, 0.1–0.5 Hz and 2–8 Hz, we find similar amplitudes for the velocity drop, which indicates that changes are not restricted to the shallow subsurface. Possible interpretations of this velocity decrease are a decrease of crustal stress after the earthquake, a nonlinear site response in the shallow subsurface layer due to strong ground motion, or structural weakening due to the creation of new fractures in the source area of the earthquake.

[1]  Christoph Sens-Schönfelder,et al.  Fault zone monitoring with passive image interferometry , 2007 .

[2]  T. V. McEvilly,et al.  Stability of P an S velocities from Central California quarry blasts , 1974, Bulletin of the Seismological Society of America.

[3]  Kuo-Liang Wen,et al.  Nonlinear Soil Response a Reality? , 2022 .

[4]  Xu,et al.  Evidence of shallow fault zone strengthening after the 1992 M7.5 landers, california, earthquake , 1998, Science.

[5]  R. Snieder,et al.  Increase of shear wave velocity before the 1998 eruption of Merapi volcano (Indonesia) , 2006 .

[6]  R. Bechmann,et al.  Numerical data and functional relationships in science and technology , 1969 .

[7]  Y. Ben‐Zion,et al.  Temporal Changes of Shallow Seismic Velocity Around the Karadere-Düzce Branch of the North Anatolian Fault and Strong Ground Motion , 2006 .

[8]  John E. Vidale,et al.  Damage to the shallow Landers fault from the nearby Hector Mine earthquake , 2003, Nature.

[9]  Takeshi Nishimura,et al.  Time-lapse changes of seismic velocity in the shallow ground caused by , 2009 .

[10]  G. Beroza,et al.  Evidence for Widespread Nonlinear Strong Ground Motion in the MW 6.9 Loma Prieta Earthquake , 2004 .

[11]  K. Doi,et al.  In situ measurements of elastic wave velocity in a mine, and the effects of water and stress on their variation , 1988 .

[12]  G. Beroza,et al.  Coseismic and postseismic velocity changes measured by repeating earthquakes , 2004 .

[13]  Kazuro Hirahara,et al.  Temporal variations of crustal structure in the source region of the 2007 Noto Hanto Earthquake, central Japan, with passive image interferometry , 2008 .

[14]  T. McEvilly,et al.  Travel-time monitoring with vibroseis , 1981 .

[15]  Hiroyuki Fujiwara,et al.  Recent Progress of Seismic Observation Networks in Japan , 2004 .

[16]  Michel Campillo,et al.  Towards forecasting volcanic eruptions using seismic noise , 2007, 0706.1935.

[17]  G. Beroza,et al.  Depth constraints on nonlinear strong ground motion from the 2004 Parkfield earthquake , 2005 .

[18]  Keiiti Aki,et al.  Solid earth tide and observed change in the in situ seismic velocity , 1973 .

[19]  Takahiro Kunitomo,et al.  Continuous monitoring of propagation velocity of seismic wave using ACROSS , 2002 .

[20]  Roel Snieder,et al.  Coda Wave Interferometry for Estimating Nonlinear Behavior in Seismic Velocity , 2002, Science.

[21]  Y. Okada.  Internal deformation due to shear and tensile faults in a half-space , 1992, Bulletin of the Seismological Society of America.

[22]  Christoph Sens-Schönfelder,et al.  Passive image interferometry and seasonal variations of seismic velocities at Merapi Volcano, Indonesia , 2006 .

[23]  Paul Segall,et al.  Post-earthquake ground movements correlated to pore-pressure transients , 2003, Nature.

[24]  Michel Campillo,et al.  Emergence of broadband Rayleigh waves from correlations of the ambient seismic noise , 2004 .

[25]  Michael Fehler,et al.  Seismic Wave Propagation and Scattering in the Heterogeneous Earth , 2012 .

[26]  J. Vidale,et al.  Seismic Evidence for Rock Damage and Healing on the San Andreas Fault Associated with the 2004 M 6.0 Parkfield Earthquake , 2005 .

[27]  S. Day,et al.  Postseismic Fault Healing on the Rupture Zone of the 1999 M 7.1 Hector Mine, California, Earthquake , 2002 .

[28]  William L. Ellsworth,et al.  Monitoring velocity variations in the crust using earthquake doublets: An application to the Calaveras Fault, California , 1984 .

[29]  T. Nishimura,et al.  Temporal change in site response caused by earthquake strong motion as revealed from coda spectral ratio measurement , 2006 .

[30]  G. Beroza,et al.  Source array analysis of coda waves near the 1989 Loma Prieta, California, mainshock: Implications for the mechanism of coseismic velocity changes , 1997 .

[31]  Roel Snieder,et al.  The Theory of Coda Wave Interferometry , 2006 .

[32]  Keiiti Aki,et al.  A precise, continuous measurement of seismic velocity for monitoring in situ stress , 1974 .

[33]  P. Leary,et al.  Systematic monitoring of millisecond travel time variations near Palmdale, California , 1979 .

[34]  Michel Campillo,et al.  High-Resolution Surface-Wave Tomography from Ambient Seismic Noise , 2005, Science.

[35]  Time-lapse traveltime change of singly scattered acoustic waves , 2006 .

[36]  Torben Risbo,et al.  Precise continuous monitoring of seismic velocity variations and their possible connection to solid Earth tides , 1977 .

[37]  G. Beroza,et al.  Seismic velocity reductions caused by the 2003 Tokachi‐Oki earthquake , 2007 .

[38]  H. Hamaguchi,et al.  Temporal changes of the crustal structure associated with the M6.1 earthquake on September 3, 1998, and the volcanic activity of Mount Iwate, Japan , 2000 .

[39]  R. Snieder,et al.  Time-lapse travel time change of multiply scattered acoustic waves , 2005 .

[40]  T. McEvilly,et al.  Seismological studies at Parkfield IV: Variations in controlled-source waveform parameters and their correlation with seismicity, 1987 to 1995 , 1997, Bulletin of the Seismological Society of America.

[41]  F. Brenguier,et al.  Postseismic Relaxation Along the San Andreas Fault at Parkfield from Continuous Seismological Observations , 2008, Science.

[42]  G. Beroza,et al.  Nonlinear strong ground motion in the ML 5.4 Chittenden earthquake: Evidence that preexisting damage increases susceptibility to further damage , 2004 .