地震仪器

电磁振动台是一种实验设备，用于模拟地震或其他振动环境，以研究物体在不同振动条件下的行为和性能。它由一个电磁振动器和一个工作台组成，电磁振动器通过电磁感应产生电流，从而产生电磁力，将工作台上的物体进行振动。电磁振动台广泛应用于工程、建筑、材料、地质等领域的实验研究和产品测试。

2009年4月6日在意大利阿布罗佐发生的地震造成了约300人丧生。不仅如此，许多的艺术建筑几乎被完全摧毁或濒临坍塌。在阿奎拉城和附近的小村庄，许多记载着数个世纪历史的纪念碑，重要的古建筑：教堂、宫殿和城堡都急待修复。但在修复之前，首先要进行检测。就像人一样，这些珍贵的壁画也要先进行评估，然后再予以“救治”。这种危急情况就需要有快速，安全，可靠的工具。

We introduce and test an experimental approach to simulate elastoplastic megathrustearthquake cycles using an analogue model and apply it to study the seismotectonicevolution of subduction zones. The quasi-two-dimensional analogue model featuresrate- and state-dependent elastic-frictional plastic and viscoelastic material properties andis scaled for gravity, inertia, elasticity, friction, and viscosity. The experiments aremonitored with a high-resolution strain analysis tool based on digital image correlation(particle imaging velocimetry, PIV), providing deformation time series comparable toseismologic, geodetic, and geologic observations. In order to separate elastic andnonelastic effects inherent the experimental deformation patterns, we integrate elasticdislocation modeling (EDM) into a hybrid approach: we use the analogue earthquake slipand interseismic locking distribution as EDM dislocation input and forward model thecoseismic and interseismic elastic response. The residual, which remains when the EDMprediction is subtracted from the experimental deformation pattern, highlights theaccumulation of permanent deformation in the model. The setup generates analogueearthquake sequences with realistic source mechanisms and elastic forearc response andrecurrence patterns and reproduces principal earthquake scaling relations. By applyingthe model to an accretionary-type plate margin, we demonstrate how strain localization atthe rupture peripheries may lead to a seismotectonically segmented forearc, including atectonically stable shelf and coastal high (20% plate convergence accommodated byinternal shortening) overlying the area of large megathrust earthquake slip. Fifty to 75% ofplate convergence is accommodated by internal shortening in the slope region whereearthquake slip tapers out toward the trench. The inner forearc region remains undeformedand represents a basin.