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Research for the Volcanic and Seismic Activity in Luzon

吕宋岛火山和地震活动研究

基本信息

批准号：
07041101
负责人：
ANDO Masataka
金额：
$ 7.17万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07041101/
关键词：
Philippine Seismic Monitoring Macolod Corridor GPS Measurement pull-apart of crust rifting Caldera リフト衝突地震観測 GPS観測三次元構造東シナ海

项目摘要

1) The Macolod Corridor in Southwestern Luzon is an approximately 40 km wide zone of active intense Quaternary volcanism which crosses perpendicular the Island in a NE-SW direction and this zone is considered to be a pull-apart rift zone. In order to determine the displacement velocity of crustal movement in Macolod Corridor, GPS measurements were executed. Thirteen stations were established in Luzon, Mindoro, and Marinduque islands during observation period in April and September, 1996. A 24 hours continuous measurement was made for 3-6 days at each station with a rate of one sample per 30 seconds. After a baseline analysis including data at Manila, IGS station, we got a displacement velocity in and around the Macolod Corridor, which shows such a large value as 2 cm/year. To check whether this value includes some errors caused by vapor in atmosphere, we executed a GPS measurement at 9 stations in January and February, 1997 with a observation period of 5 days.2) To check the presence of a slab between the Manila and the Negros trenches, we installed 9 seismic stations in Luzon, Mindoro, Marinduque, Tablas, Sibuyan and Panay islands and seismic activity in this region was monitored. Distances between stations varied from 60 to 90 km. However, during the nine-month observation period, only local seismicity around some stations were directed and we could not get a hypocenter along a subducting slab because of short period observation, low seismicity, and some technical problems like power failure.3) In order to study pre-calderagenic eruption material and history of magma plumbing system in the Macolod Corridor, we collected volcanic rock samples around Taal volcano, a large caldera volcano, and Lagna de Bay. Petrological and Geochronological study were started such as trace element analysis and K-Ar dating.

1)吕宋岛西南部的Macolod走廊是一个约40 km宽的活跃强烈的第四纪火山活动区，以东北-西南方向垂直穿过该岛，该区域被认为是一个拉分裂谷带。为了确定马科洛德走廊地壳运动的位移速度，进行了GPS测量。在1996年4月和9月的观测期间，在吕宋岛、民都洛岛和马林杜克岛建立了13个观测站。在每个站点以每30秒一个样品的速率进行3-6天的24小时连续测量。通过对马尼拉IGS站的观测资料进行基线分析，得到了马科洛德走廊及其周边地区的位移速率，其值高达2cm/年。为了验证该值是否包含大气中水汽引起的误差，我们于1997年1月和2月在9个台站进行了为期5天的GPS测量。2）为了验证马尼拉和内海沟之间是否存在板，我们在吕宋岛，民都洛岛，马林杜克岛，塔布拉斯岛，监测了Sibuyan和Panay群岛以及该地区的地震活动。站点之间的距离从60公里到90公里不等。但由于观测周期短、地震活动性低以及停电等技术问题，在9个月的观测期间，仅对部分台站周围的局部地震活动进行了定向，未能沿俯冲板沿着得到震源。3）为了研究马科洛德走廊火山爆发前的喷发物质和岩浆管道系统的历史，我们采集了塔尔火山周围的火山岩样品，一座巨大的火山口和拉格纳湾岩石学和年代学研究开始，如微量元素分析和K-Ar定年。