Coring and Geophysical Logging of a Deep Well in the Mississippi Embayment

新马德里地震带(NMSZ)的主要地质特征是从伊利诺伊州南部延伸到墨西哥湾的密西西比湾。它由田纳西州孟菲斯附近最大厚度约为915米的深层松散沉积物组成。关于海湾地区土壤的动态特性，可获得的数据相对较少。因此，目前了解深层沉淀柱对地震现场响应影响的努力存在很大的不确定性。这一探索性研究项目的目标是进行地球物理测井，并从阿肯色州东北部的一口深井中获取样本。预期的结果是地震波的波速、品质因数和海岸土的非线性行为。与在油井中安装垂直阵列的补充工作相结合，该项目将能够开发和验证用于预测密西西比湾地震现场反应的数值模型。

The dominant geologic feature of the New Madrid Seismic Zone (NMSZ) is the Mississippi Embayment that extends from southern Illinois to the Gulf of Mexico. It is composed of deep, unconsolidated sediments with a maximum thickness of approximately 915 m near Memphis, TN. Relatively little data is available on the dynamic properties of soils in the Embayment. As a result, current efforts to understand the effects of the deep sediment column on earthquake site response are subject to large uncertainties.This objective of this exploratory research project is to perform geophysical logging and obtain samples from a deep well to be drilled in northeast Arkansas. The expected results are the seismic wave velocities, quality factors, and nonlinear behavior of the Embayment soils. When combined with a complementary effort to install a vertical array in the well, this project will enable the development and validation of numerical models used to predict earthquake site response in the Mississippi Embayment.