The Relation between Source Parameters of the Earthquakes Occur in Ryukyu-Taiwan-Manila Collision System

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Project title

Code/計畫編號

MOST109-2116-M019-001

Translated Name/計畫中文名

琉球-臺灣-馬尼拉碰撞系統之地震震源參數關係研究

Project Coordinator/計畫主持人

Yi-Ling Huang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

黃瑞德

Department/Unit

Institute of Earth Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=13546820

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

534千元

ResearchField/研究領域

地球科學

臺灣位處板塊碰撞邊緣，東北接琉球碰撞帶，南連馬尼拉碰撞系統，整個區域地震頻繁、不乏中、大規模地震。因此，探討此區域地震震源參數特徵與彼此之間的關連十分重要，除了學術上可了解整個系統的孕震機制，防災上亦可由對大地震震源參數的預估，提供震源破裂或地動模擬的依據。震源參數可幫助研究地震的破裂行為，其中，震源時間函數反應了地震發生到結束的時間歷程。震源破裂歷時包括上揚時間和破裂時間，上揚時間可用以討論震源動態破裂行為和斷層強度，破裂時間則反應地震破裂尺度、速度、方向性等。此外，震源時間函數也可用來估算震源輻射能量、反演震源破裂過程、分析震源的多重破裂及破裂速度變化等。過去在整個碰撞系統內對於各項震源參數與其彼此間的關係缺少系統性研究，且所有研究成果幾乎集中在靠近臺灣本島區域。然而整個碰撞帶由南到北、甚至更南更北延伸至印尼和日本，孕震構造息息相關，因此本計畫希望利用先前計畫已得之結果、結合非負解平滑化阻尼最小平方時間域解迴旋技術，從遠震P波資料求解整個碰撞系統震矩規模大於5.5之地震的震源時間函數，依此探討震源歷時、破裂速度、破裂長度及震源輻射能量與地震矩的關係，並期望能提供地震防災評估的參考。 Taiwan locates on the collision between the Philippine Sea Plate and the Eurasian Plate. The northeastward is Ryukyu collision system and connects with Manila collision system in the south. Huge amount of earthquakes occur in the Ryukyu-Taiwan-Manila collision system including moderate and large events. Source parameters imply the important information of fault rupture, and can be applied to the source rupture and strong ground motion simulations for reducing the loss of earthquake disaster. Hence, to probe into the characteristics and relations between source parameters are important not only for scientific researches but also for disaster prevention. One of the important source parameters is source time function. It supplies the information of fracture history and records not only the rupture duration but also the feature of rupture. The duration of source time function includes rise time and rupture time, they imply different features of fault rupture. Rise time implies the strength of fault material and can supply the information for discussing the dynamic rupture behavior of source. Rupture time involves the rupture scale, rupture velocity and rupture directivity of fault. Source time function also can be used to study the source energy radiation, rupture process, multiple fracture and rupture velocity variation of fault. The systematic study was deficient in source duration, rupture velocity, rupture length and source radiation energy of Ryukyu-Taiwan-Manila collision system, especially the most studies were focused on the Taiwan region. However, the collision systems are closely bound up with seismogenic zone from south to north, hence, to establish a systematic analysis for discussing and understanding the characteristics and relation between source parameters is important. The aims of this project are: (1) To combine the results of our previous study and a far-field P wave time domain deconvolution method to estimate the source parameters of moderate and deep events in this collision system; (2) To take the results above-mentioned to be the basic information for discussing the characteristics and relations between source parameters; (3) To provide information not only for scientific explorations but also for disaster prevention.

Keyword(s)

震源時間函數
震源輻射能量
地震矩
source time function
source radiation energy
seismic moment

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The Relation between Source Parameters of the Earthquakes Occur in Ryukyu-Taiwan-Manila Collision System

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