温暖与寒冷的降温变形的地震后果:来自日本西南部和东北部的例子
1Department of Geology, Arizona State University, Tempe, AZ 85287-1404, USA. Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC V8L 4B2, Canada.
概括
俯冲区的温度变化,影响地震活动和火山活动. 温暖的地区,比如日本西南部,由于海洋地中明显的变形反应,地震较浅,火山活动较少.
科学领域:
- 地质物理学 地质物理学
- 石化学 石化学是一门学科.
- 地震学 地震学
背景情况:
- 俯冲区显示了地震性,地震结构和弧形岩的变化.
- 这些变化与海洋地中发生的变态反应有关.
- 西南日本和东北日本代表了对比的潜水带环境.
研究的目的:
- 为了研究潜伏区之间的热差异.
- 为了将这些热变化与观测到的地震性和弧形 magma 的差异相关联.
- 为了建模海洋地中发生的变态反应.
主要方法:
- 在日本西南部和东北部地震性和弧火山活动的比较分析.
- 热石学模型的开发和应用.
- 模拟变态反应,包括生态转化和脱水.
主要成果:
- 据预测,日本西南部的地将比日本东北部下面的温度高出300-500°C.
- 较高的温度导致较浅的生态转化和脱水反应.
- 在西南日本的地震深度达到65公里,日本东北部的地震深度为200公里.
- 与日本东北部相比,日本西南部的弧形火山活动较少.
结论:
- 温度是一个关键因素,控制了海洋地沉降的变态反应.
- 潜伏区的热变化直接影响地震深度和弧形岩强度.
- 在更温暖的俯冲区可能会发生微弱的融化,影响地幔石化学和弧形活动.
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