The geology of this part of the Andes is a result of the eastward subduction of the Nazca tectonic plate underneath South America.

该区域安第斯山脉的地质结构是纳斯卡板块向东俯冲，下穿垫在南美版块之下。

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Per the Zetas, this was due to the nature of the plate adjustments, which involved subduction, a lateral movement, rather than rising or falling land under water.

根据齐塔人的说法，这取决于板块调整的横向运动和俯冲特性，而不是海底发生了升降。

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Subduction and collision theory of Plate tectonics is a basement of the study of granite tectonic dyna mics and geodynamics.

板块俯冲碰撞理论曾是花岗岩构造动力学、地球动力学研究的主线。

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Instead of occurring at a plate boundary along an area called a subduction zone, where one tectonic plate is diving beneath another, this earthquake occurred in the middle of an oceanic plate, where the faults in the crust essentially moved from side to side instead of up and down.

MSN: Why this Indonesia quake didn't spark a monster tsunami

But on that fateful Friday, when the North American plate slid over the Pacific plate along a subduction zone running 130km (80 miles) off the Pacific coast of northern Japan, the shock leapt from the first segment to a second and on to a third, extending the fault zone some 400km and increasing its intensity more than 30-fold.

ECONOMIST: The myth and reality of the Japanese earthquake

Although they are sometimes produced by landslides on the seafloor, significant tsunamis are typically created by subduction earthquakes, when one massive oceanic plate suddenly lurches deeper beneath another plate, shoving up a huge section of the seafloor.

MSN: Why this Indonesia quake didn't spark a monster tsunami