Seismic interferometry using non‐volcanic tremor in Cascadia
Seismic interferometry using non‐volcanic tremor in Cascadia
复制标题
利用卡斯卡迪亚非火山震颤进行地震干涉测量
DOI：
10.1029/2007gl028987
复制
发表时间：
2007
影响因子：
5.2
通讯作者：
M. Bostock
中科院分区：
文献类型：
--
作者：
J. Chaput;M. Bostock
迄今为止，由于缺乏深层高频噪声源，地震干涉测量主要集中在表面波上。在这里，我们研究了利用卡斯卡迪亚俯冲带的非火山震动作为噪声源来恢复散射体波对格林函数的贡献。2004-2005年在北极星- BC台站TWKB、MGCB和LZB记录的地震数据进行了过滤和交叉相关。TWKB和MGCB相关性对于垂直分量与径向分量或横向分量的组合产生高度可重复性的4.5 s。TWKB和LZB相关性的可重复性较差，但在2005年达到了3.5 s。考虑到源/接收器的几何形状、极性和时序，我们将这些到达解释为反射-转换。到达时间暗示这些信号起源于9至12公里的深度，与1987年岩石探测器在南科迪勒拉样带成像的强反射率间隔一致。
Seismic interferometry to date has focussed on surface waves, due to paucity of deep, high‐frequency noise sources. Here, we investigate use of non‐volcanic tremor on the Cascadia subduction zone as a noise source to recover scattered body‐wave contributions to the Green's function. Tremor data for 2004–2005 recorded at Polaris‐BC stations TWKB, MGCB and LZB were filtered and cross‐correlated. TWKB and MGCB correlations generate a highly reproducible arrival at 4.5 s for combinations of vertical with radial or transverse components. TWKB and LZB correlations are less reproducible, but yield a strong arrival at 3.5 s for 2005. Upon consideration of source/receiver geometry, polarity and timing, we interpret these arrivals to represent reflection‐conversions. Arrival times imply that these signals originate at depths between 9 and 12 km, coincident with an interval of strong reflectivity imaged in the 1987 Lithoprobe Southern Cordillera transect.
影响因子：
56.9
作者：
Shapiro, NM;Campillo, M;Ritzwoller, MH
通讯作者：
Ritzwoller, MH