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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Active deformation in eastern Indonesia and the Philippines from GPS and seismicity data
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Active deformation in eastern Indonesia and the Philippines from GPS and seismicity data

机译：GPS和地震数据对印度尼西亚东部和菲律宾的主动变形

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In this study we combine Global Positioning System (GPS) velocities with information on the style of regional seismicity to obtain a self-consistent model velocity and strain rate field for the entire eastern Indonesia and Philippines region. In the process of interpolating 93 previously published GPS velocities, the style and direction of the seismic strain rate field, inferred from earthquakes with M-0 < 1 X 10(20) N m (from the Harvard centroid moment tensor catalog), are used as constraints on the style and direction of model strain rates within the plate boundary zones. The style and direction of the seismic strain rate field are found to be selfsimilar for earthquakes up to M-0= 1 X 10(20) N m (equivalent to M-w < 7.3). Our inversion result shows the following: The Java Trench, which lacks any significant (historic) seismicity, delineates the Australian plate (AU) - Sunda block (Sunda) plate boundary west of the island of Sumba. East of Sumba, convergence is distributed over the back are and Panda Sea, and there is no subduction at the Timer Trough, suggesting that the northern boundary of the AU plate runs north of this part of the Panda are through the Panda Sea. In New Guinea most motion is taken up as strike-slip deformation in the northern part of the island, delineating the Pacific plate (PA) AU boundary. However, some trench-normal convergence is occurring at the New Guinea Trench, evidence that the strain is partitioned in order to accommodate oblique PA-AU motion. PA-AU motion is consistent with NUVEL-1A direction, but similar to 8 mm yr(-1) slower than the NUVEL-1A estimate for PA-AU motion. The Sulawesi Trench and Molucca Sea delineate zones of high strain rates, consistent with high levels of active seismicity. The Sulawesi Trench may take up some of the AU-Sunda motion. Philippine Sea plate motion is in a direction slightly northward of the NUVEL-1A estimate and is partitioned in some strike-slip strain rates along the Philippine Fault and relatively larger trench-normal convergence along the Philippine Trench and on the Philippine mainland in the southern Philippines and along the Manila Trench in the northern Philippine islands. The high level of strain rate along the Manila Trench is not released by any significant (historic) seismic activity. For the entire eastern Indonesia - Philippines region, seismicity since 1963 has taken up similar to 40% of the total moment rate inferred from our model. [References: 70]
机译：在这项研究中，我们将全球定位系统（GPS）的速度与区域地震活动风格的信息结合起来，以获得整个印度尼西亚东部和菲律宾地区的自洽模型速度和应变率场。在插值93个先前发布的GPS速度的过程中，使用了M-0 <1 X 10（20）N m的地震（来自哈佛质心矩张量目录）推断出的地震应变率场的样式和方向。限制了板边界区域内模型应变率的样式和方向。发现在M-0 = 1 X 10（20）N m（相当于M-w <7.3）以下的地震中，地震应变率场的样式和方向是自相似的。我们的反演结果表明：Java海沟没有任何重大的（历史）地震活动，它描绘了Sumba岛以西的澳大利亚板块（AU）-da他块（Sunda）板块边界。在Sumba以东，收敛分布在后海和熊猫海上，并且在计时器槽处没有俯冲，这表明AU板块的北边界在熊猫这部分的北部延伸穿过熊猫海。在新几内亚，大多数运动被吸收为该岛北部的走滑变形，勾勒出太平洋板块（PA）AU边界。但是，新几内亚海沟正在发生一些海沟正态收敛，这表明应变是为了适应斜向PA-AU运动而分配的。 PA-AU运动与NUVEL-1A方向一致，但比NUVEL-1A对PA-AU运动的估计慢了8 mm yr（-1）。苏拉威西海沟和莫卢卡海划定了高应变率区域，与高水平的地震活动相吻合。苏拉威西海沟可能承担了一些非苏打运动。菲律宾海盘运动的方向略高于NUVEL-1A估计值的北部，并且沿菲律宾断层以一定的走滑应变率划分，并且沿菲律宾海沟和菲律宾南部的菲律宾大陆划分为相对较大的海沟法向收敛以及菲律宾北部岛屿的马尼拉海沟。任何重大的（历史性）地震活动都不会释放马尼拉海沟沿线的高应变率。对于整个印度尼西亚东部-菲律宾地区，自1963年以来的地震活动已占到我们模型推断的总矩速率的40％左右。 [参考：70]

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