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Low free-field accelerations of the 1999 Kocaeli earthquake?

机译：1999年科贾埃利地震的自由场加速度低吗？

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摘要

The August 17, 1999 Kocaeli earthquake ruptured the earth's surface along 145 km and produced a magnitude of M-w = 7.4. As expected for such an event Modified Mercalli intensities of typically IX and X in the vicinity of the fault were determined. Yet the observed accelerations at the five near-fault sites remained amazingly small with horizontal PGA values of 0.14 g to 0.4 g. We attempt to resolve the enigma by modeling surface ground motion with a finite-difference algorithm, utilizing two different rupture and slip histories derived from the strong-motion observations and 'translate' the computed horizontal motion in intensity values. We can show that ( a) in a given simple crustal velocity model different slip distributions result in significantly different ground motion distributions in the vicinity of the fault even though both slip distributions fit the observed accelerometer data quite well. (b) Both slip distributions 'project' high ground motion into areas adjacent to the fault where no accelerometer was located. ( c) Both slip distributions are not fully compatible with observed intensity observations around the fault, although this could be partly attributed to the lack of knowledge regarding to the crustal structure. In the light of our results it would thus be misleading if the few strong-motion observations around the Kocaeli earthquake fault were taken as typical or representative for the entire area and for potential future events.
机译：1999年8月17日的科贾埃利地震在145公里处使地球表面破裂，震级M-w = 7.4。如预期的那样，确定了断层附近典型的IX和X的修正Mercalli强度。然而，在水平附近的PGA值为0.14 g至0.4 g时，在五个附近断层现场观察到的加速度仍然非常小。我们尝试通过使用有限差分算法对地表运动建模来解决谜团，利用从强运动观测中得出的两种不同的破裂和滑动历史，并将计算出的水平运动“转换”为强度值。我们可以证明：（a）在给定的简单地壳速度模型中，即使两个滑动分布都很好地拟合了观测到的加速度计数据，不同的滑动分布也会在断层附近导致明显不同的地面运动分布。 （b）两种滑动分布都将高地面运动“投影”到断层附近没有加速度计的区域。 （c）两种滑动分布都与断层周围的强度观测值不完全兼容，尽管这可能部分归因于对地壳结构缺乏了解。根据我们的结果，如果将科贾埃利地震断层周围的少数强运动观测作为整个地区以及未来潜在事件的典型或代表，将会产生误导。

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