On features of spatial and temporal variation of seismicity before and after moderate earthquakes.

Swarm-like seismic activity including six moderate events (Mj = 5.1-5.4) occurred in 1989, 1990 and 1997 in the same area as the 2000 Western Tottori Earthquake (Mj = 7.3). For each time period, we carried out temporary seismic observations in and around the source area and processed the data together with data from permanent stations, to determine the hypocenters precisely. In this study we also redetermined the earthquake locations in each seismic activity using a two-step master event technique with common master events, so that the accuracy in the relative locations of the events was improved. The purpose of this study is to clarify the relationship between the preceding seismic activity and the mainshock in 2000 by comparing the hypocenter distributions. The relocated hypocenter distributions show that the three preceding swarms occurred in different parts of the same fault plane as the 2000 Western Tottori Earthquake. The b-values of the preceding swarms were low (0.51-0.67), suggesting a high stress level in the area. The mainshock initiated in the area of the preceding swarms. The rupture propagated with relatively small slip (∼1 m) in the area for the first three seconds. Then, it developed to main rupture with large slip (2-4 m) outside the area toward the southeast.

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“…The velocity model is the one used at the Tottori Observatory (Oike, 1975;Shibutani and Oike, 1989).…”

Section: The Swarm-like Activity In 1989 1990 and 1997mentioning

confidence: 99%

Swarm-like seismic activity in 1989, 1990 and 1997 preceding the 2000 Western Tottori Earthquake

et al. 2014

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“…Significant fluctuations in seismic activity have been reported in, e.g., Kamchatka and the Kuril Islands (FEDOTOV, 1968), California, and, notably, Parkfield (BAKUN and MCEVILLY, 1984), China (MCGUIRE and BARNHARD, 1981), the New Madrid Zone, U.S.A. (MENTO et al, 1986), Greece (PAPADOPOULOS and VOIDOMATIS, 1987) and the North Sea (LINDHOLM et al, 1990). For other areas, the seismic activity shows temporal variations but it is not clear whether these changes are periodic, e.g., southern Italy (BOTTARI and NERI, 1983), New Zealand (VERE-JONES and DAVIS, 1966), the Alpine-Himalayan belt (RAO and KALIA, 1986), Japan (SHIBUTANI and OIKE, 1989) and all subduction zones of the Circum-Pacific Belt (LAY et al, 1989). Global seismicity also shows temporal variation but with no clear periodicity (e.g., KANAMORI, 1981;SHIMSHONI, 1984).…”

Section: Assumptionsmentioning

confidence: 99%

Parametric-historic Procedure for Probabilistic Seismic Hazard Analysis Part I: Estimation of Maximum Regional Magnitude m max

Kijko¹,

Graham²

1998

Pure and Applied Geophysics

164

101

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A new methodology for probabilistic seismic hazard analysis (PSHA) is described. The approach combines the best features of the ''deductive'' (CORNELL, 1968) and ''historical'' (VENEZIANO et al., 1984) procedures. It can be called a ''parametric-historic'' procedure. The maximum regional magnitude m max is of paramount importance in this approach and Part I of our work presents some of the statistical techniques which can be used for its evaluation. The work is an analysis of parametric procedures for the evaluation of m max , when the form of the magnitude distribution is specified. For each of the formulae given there are notes on its origin, assumptions made of its derivation, and some comparisons. The statistical concepts of bias and variance are considered for each formula, and appropriate expressions for these are also given. Also, following KNOPOFF and KAGAN (1977), we shall demonstrate why there must be a finite upper bound to the largest seismic event if the Gutenberg-Richter frequency-magnitude relation is accepted.

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An application of Bayesian (ABIC) smoothing methods to estimating space and time variations in the magnitude distributions of earthquakes

Imoto

1991

Ann Inst Stat Math

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On features of spatial and temporal variation of seismicity before and after moderate earthquakes.

Cited by 9 publications

References 15 publications

Swarm-like seismic activity in 1989, 1990 and 1997 preceding the 2000 Western Tottori Earthquake

Swarm-like seismic activity in 1989, 1990 and 1997 preceding the 2000 Western Tottori Earthquake

Parametric-historic Procedure for Probabilistic Seismic Hazard Analysis Part I: Estimation of Maximum Regional Magnitude m max

An application of Bayesian (ABIC) smoothing methods to estimating space and time variations in the magnitude distributions of earthquakes

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