Collaborative Research: A Real-Time Nearshore Seafloor Seismic Station

合作研究：实时近岸海底地震台

• 批准号: 0241138
• 负责人: Keith Vonderheydt
• 金额: $ 55.13万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-11-01 至 2007-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0241138&HistoricalAwards=false
• 关键词: Collaborative; Research; Real; Time; Nearshore

Proposal Title: Collaborative Research: A Real-Time Nearshore Seafloor Seismic Station Funds are requested to develop and test a mooring system to collect real time, high bandwidth seismic information from the coastal ocean, which at active margins presents a variety of fundamental scientific questions related to tectonics and earthquake mechanics. This region is also characterized by seismic and volcanic hazards that can be better monitored using offshore stations. The proposed Real Time Offshore Seismic Station (RTOSS) consists of three elements: a buried seismometer with real-time output, a hardwired compliant connection from the seismometer to a surface buoy, and a solar powered RF telemetry link from the surface buoy to a shore station. LDEO will develop the seismic instrumentation and the deployment/burial mechanism for the sensor and the USGS will implement the data archiving and web-based data dissemination system. WHOI will develop the mooring system, RF telemetry system and lead the mooring operations field efforts. The key element in the mooring design is a 30-meter long hose that connects the anchor to the vertical part of the mooring. This hose is capable of stretching to 2.4 times its unstretched length under normal mooring tensions giving the mooring the capability to respond to waves, tides and currents while maintaining tension in the mooring cable. Electrical conductors are spiraled in the hose interior to transfer signals to the E/M mooring cable and then to the surface buoy. The seismometer, which is deployed some distance from the mooring anchor and connected to it by armored cable, will be installed into the sediments to shield it from damage and provide for better coupling to the ground. Full rate data from the seismometer will be sent to the surface via the mooring cables and hose and telemetered to shore using an RF modem. The system will also collect seafloor pressure and pressure gradient data that will be used to suppress noise from ocean waves. Power for the sensor and RF link are generated by solar panels on the surface buoy. System development and prototype fabrication is scheduled for Year 1. During Year 2, a long-term test of the system will be conducted at a site near Woods Hole. The mooring will be deployed in Year 3, and operated near Kick'em Jenny, an underwater volcano with high levels of seismic activity located offshore of Grenada.

提案标题：合作研究：实时近岸海底地震台 请求资金开发和测试系泊系统，以从沿海海洋收集实时、高带宽地震信息，这些信息在活动边缘提出了与构造和地震力学相关的各种基本科学问题。该地区还存在地震和火山灾害，可以使用离岸站更好地监测这些灾害。拟议的实时海上地震站（RTOSS）由三个要素组成：具有实时输出的埋地地震仪、从地震仪到地面浮标的硬连线兼容连接，以及从地面浮标到岸站的太阳能射频遥测链路。 LDEO 将开发地震仪器和传感器的部署/埋藏机制，USGS 将实施数据存档和基于网络的数据传播系统。 WHOI将开发系泊系统、射频遥测系统并领导系泊作业现场工作。系泊设计的关键要素是将锚连接到系泊垂直部分的 30 米长软管。在正常系泊张力下，该软管能够拉伸至其未拉伸长度的 2.4 倍，使系泊装置能够响应波浪、潮汐和水流，同时保持系泊缆索的张力。电导体在软管内部盘旋，将信号传输到 E/M 系泊电缆，然后传输到水面浮标。地震仪部署在距离系泊锚一定距离处，并通过铠装电缆与其连接，将安装在沉积物中，以保护其免受损坏，并提供更好的与地面的耦合。地震仪的全速率数据将通过系泊电缆和软管发送到地面，并使用射频调制解调器遥测到岸上。该系统还将收集海底压力和压力梯度数据，用于抑制海浪噪音。传感器和射频链路的电力由表面浮标上的太阳能电池板产生。系统开发和原型制造计划在第一年进行。在第二年，系统的长期测试将在伍兹霍尔附近的一个地点进行。该系泊装置将在第三年部署，并在 Kick'em Jenny 附近运行，Kick'em Jenny 是一座水下火山，位于格林纳达近海，地震活动频繁。