Time Series Analysis of Long Period Magnetotelluric Data Ii

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Project title

Code/計畫編號

MOST106-2116-M019-003

Translated Name/計畫中文名

長週期大地電磁時序資料分析II

Project Coordinator/計畫主持人

Chih-Wen Chiang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Earth Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=12236543

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

01-07-2018

Bugetid/研究經費

717千元

ResearchField/研究領域

地球科學

"臺灣地區的人文雜訊是干擾大地電磁 (MT)訊號的主要地雜訊來源之一。經驗顯示，遠湍參考技術可有效降低雜訊干擾，提升大地電磁資料量測品質，已成為國際上研究必備的重要資料處理步驟。過去臺灣MT 研究團隊常忽略此一重要關鍵資料處理步驟。探討主要原因可能與儀器限制、距離不足以及記錄時間過短等因素有關。因此，國立中央大學地球科學系MT 研究團隊，於2010 年間引進具有網路連線功能之大地電磁監測系統，目的為了提升臺灣地區MT資料品質與研究地震前兆等相關科學議題等。該系統設立至今問題不斷，包含: 資料傳輸、耗電及不穩定等問題，經常造成紀錄資料中段及研究人員維護上的困擾。本計畫預計透過自行組裝之長週期遠端大地電磁觀測系統，預期克服上述問題，提供穩定、連續性的長週期大地電磁觀測資料。觀測系統主要具備遠端遙控、低功耗、資料儲存空間大、衛星同步及高穩定性等優點。可培訓相關研究人員學習軟、硬體設計與改善能力及經驗累積、降低儀器購置成本，系統維修改善及擴充功能自主性提高。提供國內研究地球科學相關議題之重要參考資料之一，應用於: 1. 海底大地電磁儀陸地上的遠端參考站，提高資料品質之用，2. 全臺全磁場磁力站增設本系統量測精準之三分量磁場變化情形，探討台灣地區磁場與地震之間的關聯性研究， 3. 結合其他地球物理資料，進行拘限反演技術，深入探討臺灣地體構造之演化等科學研究議題。" "Cultural noise is strongly interference to magnetotelluric (MT) signals in Taiwan region. MT experiences have shown that the remote reference technology can effectively reduce noise and much improve the MT data quality of measurements. It has become an important data processing step for MT responses analysis. Most of past MT researches often ignored this important key data processing step. The major causes may be related to instrument limitations, distance and the short recording time and others effects. Therefore, the Department of Earth Sciences at National Central University introduced a first MT monitoring system with network transferring functions in order to improve data quality and study on earthquake phenomena in Taiwan in 2010. However, since the establishment of the system troubles, including: unstable data recording, transmission, power consumption and instrumental maintenance issues. The project aims to self-made a remote control of long period MT observation system that intends to overcome these problems, provides stability and continuity of long period MT data. The remote control observation system will be provided with low-power consumption, large data storage space, satellite synchronization, and high stability. The project can also be training researchers to study instrumental software and hardware design, improvement of capabilities and experiences, cost down equipment purchase budget, and system maintenance and expansion of functions by ourselves. The observatory data will also be applying for: 1. land based remote reference station for ocean bottom electromagnetic (OBEM) surveys and improve the data quality, 2. variations of threecomponents magnetic field associated with earthquake phenomenon studies, the system could widely be installed in currently total magnetic field stations, 3. Running joint inversion with other geophysical data for scientific issues such as geodynamic and tectonic evolution of Taiwan in detailed."

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Time Series Analysis of Long Period Magnetotelluric Data Ii

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