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- W2091246173 abstract "Abstract Matsumura has proposed a new parameter, ν, which characterizes the pattern of the time sequence of earthquakes, as successive, random, or periodical occurrence. The present paper describes an application of seismic pattern analysis by using the ν value from the viewpoint of earthquake prediction. Seismic data analyzed here were obtained by the NRCDP (National Research Center for Disaster Prevention) network covering the Kanto-Tokai region, Japan. The ν value was calculated for 47 seismic stations of the NRCDP in the period from July, 1979 through December, 1983. Anomalously small ν values, which are characteristic of successive occurrence, were found for thirteen particular seismic sequences. Of particular interest are precursory anomalous-decreases in the ν value prior to 9 out of 13 main events. The magnitude range of these events is from 3.9 to 7.0. The precursor time from the commencement of the anomalous decrease in the ν value to the main shock ranges from 4.5 hours to 5 days. It is less than 1 day for 6 out of 9 cases. Rates of successful prediction and predicted earthquakes were systematically examined, assuming that the shock will occur within 5 days of the beginning of an anomalous decrease in the ν value. If an earthquake is defined as one whose magnitude is 6.0 or greater and whose depth is not greater than 60 km, rates of successful prediction and predicted earthquakes were 4 9 (44%) and 4 5 (80%), respectively. The present results suggest that the pattern of time sequence of shocks, in other words, the interaction between successive shocks, is worthy to be investigated as a tool in predicting earthquakes, although assessment of the value of the ν parameter is not sufficient because of the limited amount of data in the present work." @default.
- W2091246173 created "2016-06-24" @default.
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- W2091246173 date "1987-06-01" @default.
- W2091246173 modified "2023-09-27" @default.
- W2091246173 title "Characteristic features of successive occurrences of foreshock sequences preceding recent major earthquakes in the Kanto-Tokai region, Japan" @default.
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- W2091246173 doi "https://doi.org/10.1016/0040-1951(87)90060-6" @default.
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