Temporal change of seismic structure around Iwate volcano inferred from waveform correlation analysis of similar earthquakes
Temporal change of seismic structure around Iwate volcano inferred from waveform correlation analysis of similar earthquakes
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类似地震波形相关分析推断岩手火山周边地震结构的时间变化
DOI：
10.1029/2004gl021103
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发表时间：
2004
影响因子：
5.2
通讯作者：
H. Hamaguchi
中科院分区：
文献类型：
--
作者：
T. Yamawaki;T. Nishimura;H. Hamaguchi
通过计算1995-2002年发生在太平洋板块俯冲边界的一对类似地震的P波和S波的互相关系数，研究了日本东北部岩手火山周围地壳结构的时间变化。虽然在整个期间大多数台站都观察到较大的系数，但位于岩手火山西南坡的两个台站显示出较小的S波系数。从1998年开始，这两个台站的系数显著下降，对应于一个显著的火山活动和6.1级地震的时期。自2000年以来，这些系数逐渐恢复，表明它们与岩手火山活动有关。与S波的系数相比，这些台站的P波系数较大，这表明这些台站下方地壳结构的时间变化发生在S波敏感的弹性特性中，例如刚性，与火山内部和周围的岩浆和/或地震活动有关。
We investigate the temporal change of crustal structure around Iwate volcano, northeastern Japan, using calculations of the cross‐correlation coefficients of P‐ and S‐waves of pairs of similar earthquakes that occurred between 1995–2002 at the subducting Pacific Plate boundary. While large coefficients are observed at most stations throughout the period, two stations located on the southwestern slope of Iwate volcano exhibit small S‐wave coefficients. The coefficients at these two stations decreased remarkably from 1998, corresponding to a period of significant volcanic activity and an M6.1 earthquake. Since 2000, the coefficients have recovered gradually, suggesting their correlation with the activity of Iwate volcano. The coefficients of P‐waves at these stations are large compared to those of S‐waves, suggesting that temporal change in the crustal structure beneath these stations occurred in elastic properties to which S‐waves are sensitive, such as rigidity, related to magmatic and/or seismic activity in and around the volcano.