Rapid Response to Diking/Eruptive Event at Axial Seamount, February, 1998

对轴向海山堤防/喷发事件的快速响应，1998 年 2 月

• 批准号: 9810026
• 负责人: James Cowen
• 金额: $ 5.47万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-02-15 至 2000-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9810026&HistoricalAwards=false
• 关键词: Rapid; Response; Diking; Eruptive; Event

Cowen, James P. OCE-9810026 Abstract This project is a rapid response to an seismic event on Axial seamount on the Juan de Fuca Ridge. Starting January 28, 1998, a seismic event was detected using the T-phase monitoring system developed by NOAA/PREL to access the US Navy's SOSUS arrays. Over 6000 earthquakes were detected in the first days of the event, making this the most intense seismic event yet observed in this area. The character of this seismicity is very similar to that observed at CoAxial segment and the Northern Gorda Ridge, both episodes that were later confirmed to be eruptive events. The proposal is to mount a rapid response cruise on the R/V Wecoma. The Objectives are to: (1) detect and characterize events plume(s) and other venting associated with the seismic event, (2) to deploy neutrally buoy and drifter buoys (RAFOS floats) and associated sound source array for tracking an event plume, (3) establish whether there has been a subsurface bacterial bloom, (4) advance time-series measurements of geochemical and microbial concentrations and activities in megaplume and event-initiated plumes, and (5) deploy ocean bottom hydrophones.

Cowen，James P. OCE-9810026 摘要 该项目是对Juan de Fuca海岭轴海山地震事件的快速反应。 从1998年1月28日开始，使用NOAA/PREL开发的T相监测系统进入美国海军的SOSUS阵列检测到地震事件。 在地震发生后的第一天就探测到了超过6000次地震，这是该地区迄今为止观测到的最强烈的地震事件。 这次地震活动的特征与后来证实为喷发事件的同轴段和北方戈尔达海岭的地震活动特征十分相似。 建议在“韦科马”号研究船上进行一次快速反应巡航。 目标是：（1）探测和描述与地震事件相关的事件羽流和其他喷发，（2）部署中性浮标和漂流浮标（RAFOS浮标）和相关声源阵列，用于跟踪事件羽流，（3）确定是否存在地下细菌大量繁殖，（4）对巨型羽流和事件引发的羽流中的地球化学和微生物浓度和活动进行提前时间序列测量，（5）布设海底水听器。