Spatial distribution of static stress drops for aftershocks of the 2005 West Off Fukuoka Prefecture earthquake

Iio, Yoshihisa; Katao, Hiroshi; Ueno, Tomotake; Enescu, Bogdan; Hirano, N.; Okada, Tomomi; Uchida, Naoki; Matsumoto, Satoshi; Matsushima, Takeshi; Uehira, Kenji; Shimizu, Hiroshi

doi:10.1186/bf03352670

Cited by 10 publications

(14 citation statements)

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“…For both P-and S-wave analyses, all the estimations of static stress drops are averaged across all stations available. These values approximately coincide with the estimated static stress drops of aftershocks of other inland earthquakes in Japan (Ito 2005;Iio et al 2006), although the estimation procedures used differ from those used in this study. Figure 3 shows a relationship between the local magnitude of the analyzed earthquake and the estimated static stress drop of the average case.…”

Section: Resultssupporting

confidence: 68%

Relationship between coseismic slip and static stress drop of similar aftershocks of the 2007 Noto Hanto earthquake

2015

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We have investigated the spatial distribution of the static stress drop of similar aftershocks of the 2007 Noto Hanto earthquake, central Japan, and have examined the relationship between the coseismic slip of the mainshock and the static stress drop of the similar aftershocks. The static stress drop is estimated by using the empirical Green's function method for P-and S-waves. The estimated static stress drop approximately ranges from 5 to 20 MPa, which is a typical range of values for tectonic earthquakes. The static stress drops of the aftershocks in a large slip area of the mainshock tend to be larger than those in a small slip area. This suggests a large difference between the strength and the dynamic stress level in the large slip area and a small difference in the small slip area if the final stress level is equal to the dynamic stress level.

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Section: Resultssupporting

confidence: 68%

Relationship between coseismic slip and static stress drop of similar aftershocks of the 2007 Noto Hanto earthquake

2015

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“…We consider a body with many earthquakes in ΔV, which is deformed by earthquake faulting that behaves as a volumetric source in the media surrounding ΔV. Moment tensors distributed in the volume express the inelastic deformation (Aki and Richards 1980;Ichihara et al 2016;Kusakabe et al 2016), and the relationship between inelastic strain ε p ij in the volume and the moment density tensor may be expressed using the compliance C ijkl of the volume (Noda and Matsu'ura 2010): Iio et al (2006) and the CMT catalog by NIED. Orange ovals represent the average moment value for each magnitude range at intervals of 0.2.…”

Section: Seismogenic Zone Strain Inferred From Seismic Momentsmentioning

confidence: 99%

“…The method used in this study requires information regarding the magnitude of seismic moment tensors in addition to focal mechanisms. Matsumoto (2016) adopted seismic moment (M 0 ) data by Iio et al (2006) and the moment tensor (MT) solution catalog from the National Institute of Earth Science and Disaster Resilience (NIED). For events not found in the moment tensor magnitude dataset, scalar seismic moments were inferred from empirical relationships between the scalar moment and magnitude estimated short-period velocity seismogram (M a ) as shown in Fig.…”

Section: Inelastic Strain In Kyushu Japanmentioning

confidence: 99%

“…We used seismic data from Kyushu, Kyoto, Kagoshima, and Tokyo Universities, the Japan Meteorological Agency, and Hi-net (NIED). We used moment tensor data in Matsumoto (2016), which were originally determined from data in Matsumoto et al (2015), Iio et al (2006), and the MT catalog by NIED (http://www.fnet.bosai.go.jp/ event/search.php?LANG=en). This study was supported by the "Observation and Research Program for Prediction of Earthquakes and Volcanic Eruptions" by MEXT and MEXT KAKENHI (No.…”

Section: Acknowledgementsmentioning

confidence: 99%

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Inelastic strain rate in the seismogenic layer of Kyushu Island, Japan

Matsumoto

Nishimura

Ohkura

2016

Earth Planets Space

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Seismic activity is associated with crustal stress relaxation, creating inelastic strain in a medium due to faulting. Inelastic strain affects the stress field around a weak body and causes stress concentration around the body, because the body itself has already released stress. Therefore, the understanding of inelastic deformation is important as it generates earthquakes. We investigated average inelastic strain in a spatial bin of Kyushu Island, Japan, and obtained the inelastic strain rate distribution associated with crustal earthquakes, based on the analysis of fault plane solutions and seismic moments. Large inelastic strains (>10) were found in the Beppu-Shimabara area, located in the center of Kyushu Island. The strain rate tensor was similar to that of the stress tensor except the absolute value in the area, implying that the inelastic strain was controlled by the stress field. The 2016 Kumamoto earthquake sequence (maximum magnitude 7.3) occurred in the Beppu-Shimabara area, with the major earthquakes located around the high inelastic strain rate area. Inelastic strain in the volume released the stress. In addition, the inelastic strain created an increment of stress around the volume. This indicates that the spatial heterogeneity of inelastic strain might concentrate stress.

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“…Based on their analyses of hypocenter location, focal mechanism solutions, Coulomb failure stress, and stress tensor inversion, they showed that the off-fault earthquakes were the reactivation of a structural boundary. Iio et al (2006) estimated the spatial distribution of static stress drops of the aftershocks and concluded that off-fault aftershocks were generated on very weak pre-existing fault planes based on the finding that stress drops of the off-fault earthquake were relatively small. On the other hand, the stress drops of the aftershocks occurring at the SE end of the aftershock region were large.…”

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confidence: 99%

Introduction to the special section for the 2005 West Off Fukuoka Prefecture Earthquake

Shimizu

2006

Earth Planet Sp

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On 20 March 2005, the 2005 West Off Fukuoka Prefecture earthquake with Japan Meteorological Agency magnitude (M JMA ) of 7.0 occurred in the offshore region of Fukuoka Prefecture, in northern Kyushu, Japan. This earthquake caused more than 1,000 casualties and damaged many buildings in the surrounding area, especially on Genkai Island as well as in and around Fukuoka City.Because the 2005 West Off Fukuoka Prefecture earthquake was one of the largest intraplate earthquakes in recorder history occurring ages at the junction of the Southwestern Japan Arc and the Ryukyu Arc, intensive seismological and geodetic studies were carried out in its aftermath. Ten papers from these studies were published as the special section for the 2005 West Off Fukuoka Prefecture earthquake (1) of Earth, Planets and Space, Vol. 58, No.1, 2006. In addition, eight papers are published in the special section (2) of this issue. These studies have revealed important characteristics of the earthquake as summarized in the following paragraphs.The mainshock and aftershocks were mainly aligned NW-SE in an approximately 25 km long trend, and the hypocenters of the aftershock region were distributed on a nearly vertical plane at depths of 2-16 km. The mainshock was located near the central part of the aftershock region, with a depth of 9.5 km. These findings suggest that the strike and dip of the fault plane of the earthquake are approximately N60• W and 90• , respectively, and the length and width of the fault are about 25 km and 14 km, respectively. The largest aftershock of M JMA 5.8 occurred near the SE edge of the main aftershock region, and the aftershock region extended about 5 km in the SE direction based on the secondary aftershock activity, which had a different strike angle from that of most of the aftershocks. Following the most intense aftershock activity, there was no distinct enlargement of the aftershock region, and the aftershock activity gradually declined .The fault structure has been discussed in detail on the basis of precise analyses of aftershock distribution based on onshore and offshore seismic observations made with densely located ocean bottom seismometers . The fault plane is bent near both the NW and SE Copy right c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.edges: the strike of both edges differs from that of the central part, which includes the hypocenter of the mainshock by 15• in the clockwise direction. T. and Ito et al. (2006) determined moment tensor solutions of the mainshock and aftershocks, and both groups found spatial variation of the source mechanisms which corresponded to the fault bending. Uehira et al. (2006) showed that the main fault was divided into two segments bordering on the depth of the mainshock. There are 10• differences in both of strike and the dip angles between the lower and upper segments. The ge...

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Spatial distribution of static stress drops for aftershocks of the 2005 West Off Fukuoka Prefecture earthquake

Cited by 10 publications

References 6 publications

Relationship between coseismic slip and static stress drop of similar aftershocks of the 2007 Noto Hanto earthquake

Relationship between coseismic slip and static stress drop of similar aftershocks of the 2007 Noto Hanto earthquake

Inelastic strain rate in the seismogenic layer of Kyushu Island, Japan

Introduction to the special section for the 2005 West Off Fukuoka Prefecture Earthquake

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