TA HVSR Curves and Peak Frequencies

Earthquake ground motions are modified by local geologic site conditions. Soft soils and basin sediments may amplify and prolong the duration of ground shaking, necessitating site characterization to improve existing ground motion predictions and seismic hazard analyses. Horizontal-to-Vertical Spectral Ratio (HVSR) measurements distinguish one or more site resonant frequencies and the relative amount of amplification at those frequencies with minimal cost and ground-disturbance. HVSRs are evaluated using either recordings of earthquake strong motions or hours of continuous microtremor data. Here, we provide microtremor HVSR (mHVSR) measurements at 2,194 sites across the continental United States acquired during the USArray Transportable Array experiment to support the creation and assessment of seismic velocity profiles and subsurface structure.

地震动会因局部地质场地条件发生改变。软土与盆地沉积物可放大地震动并延长振动持续时间，因此开展场地特征分析对优化现有地震动预测模型与地震危险性分析工作至关重要。水平向-竖向谱比（Horizontal-to-Vertical Spectral Ratio，HVSR）测量能够识别一个或多个场地共振频率，并量化该频率下的相对放大倍数，且具备低成本、对场地扰动极小的优势。HVSR分析可依托地震强震动记录或数小时的连续微震数据完成。本数据集提供了美国本土范围内2194个测点的微震水平向-竖向谱比（microtremor Horizontal-to-Vertical Spectral Ratio，mHVSR）测量数据，这些数据采集自美国地震阵列流动台阵（USArray Transportable Array）实验，旨在支撑地震波速度剖面与地下结构的构建与评估工作。