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首页> 外文期刊>Geophysical Research Letters >Thermal models of the middle America trench at the Nicoya Peninsula, Costa Rica - art. no. 2010
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Thermal models of the middle America trench at the Nicoya Peninsula, Costa Rica - art. no. 2010

机译：中美洲美洲沟槽的热模型在哥斯达黎加尼科亚半岛-艺术。没有。 2010

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摘要

We present thermal models of the 24 Ma Cocos plate subducting under the Caribbean plate at the Nicoya Peninsula, Costa Rica. Our modeling incorporates the effect of hydrothermal cooling of the seafloor and the absence of an accretionary prism. Initial geotherms of the incoming plate, representing different effective cooling depths of hydrothermal circulation, affect the thermal structure and temperatures along the main subduction thrust. Excluding the deforming prism results in a higher heat flow immediately landward of the trench than previous models and therefore significant frictional heating is not required. Conductive plate cooling over-predicts heat flow across the frontal forearc. With no or very low frictional heating, models with hydrothermal cooling to depths of 2 km under-predicts the heat flow. Comparisons with recently determined hypocenter locations indicate that the updip limit of seismicity is consistent with temperatures between 100degrees-150degreesC, but there are large along-strike variations in both the seismicity and thermal regime. [References: 21]
机译：我们介绍了哥斯达黎加尼科亚半岛加勒比板块下俯冲的24 Ma Cocos板块的热模型。我们的模型结合了海底水热冷却的效果以及没有增生棱镜的影响。进入板块的初始地热代表了热液循环的不同有效冷却深度，影响了沿俯冲作用主推力的热力结构和温度。排除变形棱镜会导致比之前的模型更高的热量直接流向沟槽，因此不需要显着的摩擦加热。导电板冷却过度预测了穿过额前臂的热量。在没有摩擦加热或摩擦加热非常低的情况下，采用水热冷却至2 km深度的模型会预测热量的流量。与最近确定的震源位置的比较表明，地震活动的上倾极限与100摄氏度至150摄氏度之间的温度一致，但是在地震活动和热态方面沿震荡变化很大。 [参考：21]

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