Coherency Characteristics of Body Waves Traveling in a Sedimentary Layer–Basement System in the Kanto Region, Japan
Coherency Characteristics of Body Waves Traveling in a Sedimentary Layer–Basement System in the Kanto Region, Japan
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日本关东地区沉积层基底体系中传播的体波相干特性
DOI：
10.1785/0120050082
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Miho Ohike
中科院分区：
文献类型：
--
作者：
S. Kinoshita;Miho Ohike
通过在六个站点从当地事件获得的钻孔阵列记录，我们估计了在日本关东地区沉积层-基底系统中传播的体波的相干特性。估计的相干性由 P 波和 S 波的 ω -2 模型来表征。一个重要的结果是，SH 波的行进时间小于 2.5 秒，转角频率值几乎恒定为 5-6 Hz。这表明前第三纪基底记录的基岩运动在高频下变得不连贯。此外，P 波的转角频率大约是 SH 波的两倍。因此，与 SH 波相比，P 波在高频下相干传播。
By means of borehole array recordings obtained at six stations from local events, we estimated coherency characteristics of body waves that propagate in a sedimentary layer–basement system in the Kanto region, Japan. The estimated coherence is characterized by an ω −2 model for P and S waves. An important result is that the values of corner frequency become nearly constant, 5–6 Hz, in travel times less than 2.5 sec for SH waves. This suggests that bedrock motions recorded in the pre-Tertiary basement are becoming incoherent in high frequencies. Also, the corner frequency of P waves is approximately twice that for SH waves. Hence, P waves propagate coherently in high frequencies as compared with SH waves.