Upper Plate Heterogeneity Along the Southern Hikurangi Margin, New Zealand
Upper Plate Heterogeneity Along the Southern Hikurangi Margin, New Zealand
复制标题
新西兰希库朗吉南缘沿线的上板块异质性
DOI：
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发表时间：
2020
影响因子：
5.2
通讯作者：
A. Wech
中科院分区：
文献类型：
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作者：
S. Henrys;D. Eberhart‐Phillips;D. Bassett;R. Sutherland;D. Okaya;M. Savage;Dominic Evanzia;T. Stern;Hiroshi P. Sato;K. Mochizuki;T. Iwasaki;E. Kurashimo;A. Seward;A. Wech
控制和自然源地震数据用于建立新西兰北岛南部的3-D P波模型，其中太平洋板块以约41 mm/年的速度俯冲到澳大利亚板块之下。我们的分析揭示了一个突然的沿着走向转换逆冲板块结构在库克海峡。属性（Vp、Vp/Vs和Qs）的对比可能反映了澳大利亚板块的变形程度，其中阿尔卑斯-怀劳和阿瓦特尔断层标志着自中新世早期以来经历了>50°顺时针垂直轴旋转的板块的北方边界。地壳过渡的不均匀性可能与摩擦和弹性性质的变化有关，这些变化可能影响弹性应力的积累，并抑制大型逆冲断层地震向南传播。库克海峡断层的低连通性与我们观察到的不均匀性一致，可能会在地震或缓慢滑动事件期间通过侧向应力加载促进复杂的地震触发。
Controlled and natural source seismic data are used to build a 3‐D P wave model for southern North Island, New Zealand, where the Pacific Plate subducts beneath the Australian Plate at a rate of ~41 mm/year. Our analysis reveals an abrupt along‐strike transition in overthrusting plate structure within Cook Strait. Contrasts in properties (Vp, Vp/Vs, and Qs) likely reflects the degree of deformation in the Australian Plate, where the Alpine‐Wairau and Awatere Faults mark the northern boundary of a terrane that has undergone >50° of clockwise vertical‐axis rotation since the early Miocene. Heterogeneity of the crustal transition is likely associated with changes in frictional and elastic properties that may impact elastic stress accumulation and inhibit southward propagation of megathrust earthquakes. Low connectivity of faults in Cook Strait is consistent with the heterogeneity we observe and may promote complex earthquake triggering by lateral stress loading during earthquakes or slow slip events.
影响因子：
18.3
作者：
Wallace, Laura M.;Kaneko, Yoshihiro;Fry, Bill
通讯作者：
Fry, Bill
影响因子：
3.5
作者：
Bassett, Dan;Watts, Anthony B.
通讯作者：
Watts, Anthony B.