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Yagi, Hironori

doi:10.2750/arp.25.120

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…3). Yagi (2006) analyzed the seismic wave and suggested that the earthquake occurred along shallow dipping (10 deg) thrust faults and was thus a typical interplate earthquake. Yamanaka (2006), on the other hand, made a similar analysis and suggested the possibility of high angle reverse faulting that occurred within the subducting slab.…”

Section: July 17 South Off Java Island Earthquakementioning

confidence: 99%

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Preliminary report on crustal deformation surveys and tsunami measurements caused by the July 17, 2006 South off Java Island Earthquake and Tsunami, Indonesia

et al. 2007

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A large earthquake (Mw=7.7) along a plate boundary occurred in the south of Java Island on July 17, 2006, and caused a significant tsunami. We made GPS observations and tsunami heights measurements during the period from July 24 to August 1, 2006. The earthquake seems to be due to an interplate low angle reverse faulting, though there might be a possibility of high angle faulting within the subducting lithosphere. Crustal deformation distribution due to the earthquake, aided by tsunami heights measurements, might clarify which would be the case. We occupied 29 sites by GPS in the area of southern Java encompassing the area from 107.8 E to 109.50 E. These sites were occupied once before the earthquake. However, we were not able to detect significant coseismic displacements. The obtained displacements, most of which span several years, show ESE direction in ITRF2000 frame. This represents the direction of Sunda block motion. The tsunami heights measured at 11 sites were 6-7 m along the southern coast of Java and indicate that the observed heights are systematically higher than those estimated from numerical simulations that are based on seismic data analysis. This might suggest that fault offsets might have been larger-nearly double-than those estimated using seismic analysis. These results lead us to an idea that the rupture was very slow. If this is the case, the earthquake might have been a "tsunami earthquake" that is similar to the one that occurred on June 2, 1994 in the east of the present earthquake.

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Section: July 17 South Off Java Island Earthquakementioning

confidence: 99%

“…As is shown, the displacement rate since the last survey are several tens of centimeters. Model estimation, for example based on the model by Yagi (2006), suggests only a few centimeters of displacement in the study area. Thus, the observed displacements may not represent the co-seismic crustal motion.…”

Section: Gps Observations and Analysesmentioning

confidence: 99%

Preliminary report on crustal deformation surveys and tsunami measurements caused by the July 17, 2006 South off Java Island Earthquake and Tsunami, Indonesia

et al. 2007

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“…For the case of the 2006 Java earthquake, USGS issued M s 7.2 and M w 7.2, and PTWC (Pacific Tsunami Warning Center) estimated an M wp (Tsuboi et al, 1995(Tsuboi et al, , 1999 of 7.2, and M w 7.4 (calculated from M m (Okal and Talandier, 1989) following Weinstein and Okal (2005)), while the Global CMT project (formerly known as the Harvard CMT project, and currently available at http://www.globalcmt.org/) provided M w 7.7. Several studies analyzing seismic waves (Ammon et al, 2006;Yagi, 2006;Ji, 2006) and tsunamis (Fujii and Satake, 2006) suggested that M w of this earthquake is around or greater than 7.7. This case illustrates that the current routine magnitude determination may fail for such earthquakes as the 2006 Java earthquake.…”

Section: Introductionmentioning

confidence: 99%

Magnitude determination using duration of high frequency energy radiation and displacement amplitude: application to tsunami earthquakes

Hara¹

2007

Earth Planet Sp

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Recently, we developed a new method to determine earthquake magnitudes using durations of high frequency energy radiation and the maximum displacement amplitudes, which can be measured from processing of first arriving P-waves. In the present study, we applied this method to the 1992 Nicaragua, 1994 Java, 1996 Peru, and 2006 Java earthquakes which have been suggested to be "tsunami earthquakes." Our magnitude estimates for these earthquakes are consistent with the moment magnitudes in the Global CMT catalog, which demonstrates that our method is applicable to tsunami earthquakes. The analyzed tsunami earthquakes are characterized in our method as those with longer source durations and smaller displacement amplitudes.

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“…The remaining seven seismic quiescences were followed by no earthquake with the seismic moment M 0 C 3.0 9 10 21 Nm (M w C 8.25), which are candidates of the false alarm. The 2006 Kurile Islands earthquake (M w 8.3) was an interplate thrust faulting on the upper boundary of the PA plate (Ji 2006;Yagi 2006;Yamanaka 2006). The 2006 event was not preceded by the significant seismic quiescence with Z C 6.0, which is a case of the surprise occurrence.…”

Section: Seismic Quiescences and Great Earthquakesmentioning

confidence: 99%

Long-Term Seismic Quiescences and Great Earthquakes in and Around the Japan Subduction Zone Between 1975 and 2012

Katsumata

2016

Pure Appl. Geophys.

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Abstract-An earthquake catalog created by the International Seismological Center (ISC) was analyzed, including 3898 earthquakes located in and around Japan between January 1964 and June 2012 shallower than 60 km with the body wave magnitude of 5.0 or larger. Clustered events such as earthquake swarms and aftershocks were removed from the ISC catalog by using a stochastic declustering method based on Epidemic-Type Aftershock Sequence (ETAS) model. A detailed analysis of the earthquake catalog using a simple scanning technique (ZMAP) shows that the long-term seismic quiescences lasting more than 9 years were recognized ten times along the subduction zone in and around Japan. The three seismic quiescences among them were followed by three great earthquakes: the 1994 Hokkaido-toho-oki earthquake (M w 8.3), the 2003 Tokachi-oki earthquake (M w 8.3), and the 2011 Tohoku earthquake (M w 9.0). The remaining seven seismic quiescences were followed by no earthquake with the seismic moment M 0 C 3.0 9 10 21 Nm (M w 8.25), which are candidates of the false alarm. The 2006 Kurile Islands earthquake (M w 8.3) was not preceded by the significant seismic quiescence, which is a case of the surprise occurrence. As a result, when limited to earthquakes with the seismic moment of M 0 C 3.0 9 10 21 Nm, four earthquakes occurred between 1976 and 2012 in and around Japan, and three of them were preceded by the long-term seismic quiescence lasting more than 9 years.

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Untitled

Cited by 5 publications

References 15 publications

Preliminary report on crustal deformation surveys and tsunami measurements caused by the July 17, 2006 South off Java Island Earthquake and Tsunami, Indonesia

Preliminary report on crustal deformation surveys and tsunami measurements caused by the July 17, 2006 South off Java Island Earthquake and Tsunami, Indonesia

Magnitude determination using duration of high frequency energy radiation and displacement amplitude: application to tsunami earthquakes

Long-Term Seismic Quiescences and Great Earthquakes in and Around the Japan Subduction Zone Between 1975 and 2012

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