手取川ダム砕石発破記録を利用した,Vp の時間変化について

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タイトル別名
  • ON THE TEMPORAL VARIATION OF Vp BY USINGTHE SEISMIC DATA OF QUARRY BLASTS AT TEDORI-GAWA DAM SITE
  • テドリガワ ダム サイセキ ハッパ キロク オ リヨウシタ VP ノ ジカン

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抄録

A series of quarry blasts were fired at Tedori-gawa dam site in Ishikawa prefecture, andtheir seismic waves were recorded by the telemeter network of Hokuriku MicroearthqukeObservatory from May 1976 to December 1978. The number of the blasts is 309, whose P-times were accurately read at the 5 stations of epicentral distances less than 60km.On these blasts, the eqicenters are relatively located by the Master event method usingthe three P-times of near stations, KMJ, FKJ and KAJ. Two pairs of the differences ofP-times, namely IMJ-FKJ and HKJ-KAJ, are calculated after the correction of locations forthe 309 events, and the variation is within a possible error of 0.03 sec for almost all periods.This shows us that the time variation of Vp was at most 0.7% of it, if we assume that Vpchanges simultaneously all over the region from Tedori-gawa to HKJ and KAJ.On April 3. 1978, an earthquake of magnitude 4.7 occurred near Eiheiji-Temple, Fukuiprefecture, and the location is very near the ray path of the blasts to HKJ. But, unfor-tunalely, for about three months before the events, the blasts had not been carried out, sowe have no conclusion on the change of Vp before the event.

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