Calibration of the R/V Langseth Seismic Sources

0624599 tolstoy这个为期两年的奖项授予位于纽约的哥伦比亚大学，为在墨西哥湾的三个地点进行地震声源表征研究提供支持，该研究船由该大学的Lamont-Doherty地球观测站（LDEO）运营，是大学-国家海洋实验室系统（UNOLS）研究船队的一部分。源特性将在浅水、深水和中水深进行，除了直接测量不同范围和方位角的信号水平外，还将包括测量环境参数（水柱和沉积物声速及相关特性）。震源配置将包括单个震源和各种子阵列以及完整的R/V Langseth震源阵列，除了通常用于地震反射研究的地震拖缆中的水听器外，还将记录在底部系泊和地面漂移校准的水听器上。声波传播建模将在现场测量之前和之后进行，以评估、验证和/或改进现有模型。预计震源表征的结果将用于支持改进缓解做法的工作，以遵守与人为声音有关的环境法规，并增进对朗塞斯号上震源的震源特征的了解，以便应用于地球物理研究

0624599TolstoyThis 2-year award to Columbia University in the City of New York provides support to conduct seismic sound source characterization studies at three sites in the Gulf of Mexico on R/V Marcus G. Langseth, a research vessel operated by the university's Lamont-Doherty Earth Observatory (LDEO) as part of the University-National Oceanographic Laboratory System (UNOLS) research fleet. Source characterization will be undertaken in shallow, deep and intermediate water depths, and will include measurement of environmental parameters (water column and sediment sound velocity and related properties) in addition to direct measurement of signal levels at various ranges and azimuths. Source configurations will include individual sources and various sub-arrays as well as the full R/V Langseth source array, and will be recorded on bottom-moored and surface-drifting calibrated hydrophones in addition to the hydrophones in the seismic streamer normally used for seismic reflection studies. Acoustic propagation modeling will be carried out before and after the field measurements in an effort to evaluate, validate and/or improve existing models. Results of the source characterization are expected to be used to support efforts to refine mitigation practices for compliance with environmental regulations related to anthropogenic sound as well as to improve understanding of the source characteristics of the seismic sources on R/V Langseth for application to geophysical research.***