Hydroacoustic monitoring of seismicity at the slow‐spreading Mid‐Atlantic Ridge
Hydroacoustic monitoring of seismicity at the slow‐spreading Mid‐Atlantic Ridge
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DOI：
10.1029/2001gl013912
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发表时间：
2002-06
影响因子：
5.2
通讯作者：
Deborah K. Smith;M. Tolstoy;C. Fox;D. Bohnenstiehl;H. Matsumoto;Matthew J. Fowler
中科院分区：
文献类型：
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作者：
Deborah K. Smith;M. Tolstoy;C. Fox;D. Bohnenstiehl;H. Matsumoto;Matthew J. Fowler
1999年2月，开始对大西洋中脊（MAR）北方进行长期水声监测。六个自主水听器系泊在MAR侧翼的15°N和135 °N之间。第一年的数据结果显示，沿着轴事件率存在显著变化。相邻段的组表现相似，产生沿着轴模式，在波长为1500 km处具有高和低水平的地震活动。这种大尺度的模式可能受到轴向热状态的影响。几个地震序列的变化的时间特征被检测到，这表明根本的差异，其地震活动的原因。离轴，大多数地震断层发生在距离轴中心< 15 km的区域内。
In February 1999, long‐term hydroacoustic monitoring of the northern Mid‐Atlantic Ridge (MAR) was initiated. Six autonomous hydrophones were moored between ∼15°N and ∼35°N on the flanks of the MAR. Results from the first year of data reveal that there is significant variability in along‐axis event rate. Groups of neighboring segments behave similarly, producing an along‐axis pattern with high and low levels of seismic activity at a wavelength of ∼500 km. This broad scale pattern is likely influenced by the axial thermal regime. Several earthquake sequences with variable temporal characteristics were detected, suggesting fundamental differences in the cause of their seismicity. Off‐axis, most seismic faulting occurs within a zone < 15 km from the axis center.