利用希臘統一地震網絡（HUSN）記錄的數據調查愛琴海北部的地震活動和地殼結構;An Investigation into the Seismicity and Crustal Structure of Northern Aegean Using Data Recorded by the Hellenic Unified Seismic Network (Husn)

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Title:	利用希臘統一地震網絡（HUSN）記錄的數據調查愛琴海北部的地震活動和地殼結構;An Investigation into the Seismicity and Crustal Structure of Northern Aegean Using Data Recorded by the Hellenic Unified Seismic Network (Husn)
Authors:	柯士達
Contributors:	國立中央大學地球科學學系
Keywords:	希臘;愛琴海;地震地點;地震構造;地震災害;斷層掃描;Greece;Aegean;earthquake location;seismotectonics;seismic hazard;tomography
Date:	2018-12-19
Issue Date:	2018-12-20 11:42:06 (UTC+8)
Publisher:	科技部
Abstract:	愛琴海北部的構造受到安納托利亞板塊的西推和愛琴岩石圈的重力擴張的影響，促使該區域發生縱向變形。由於這些過程，在愛琴海北部發生了幾次破壞性地震，最近一次是在2017年6月，當時震度 6.3的地震造成了Lesbos島的大面積破壞和一名傷患。此計畫旨在重新定位由希臘統一地震站及強震動傳感器在2011-2017年期間記錄到的6700項事件。首先，使用VELEST算法推導最小一維速度模型，並使用非線性概率位置代碼NLLOC獲得絕對位置。為了進一步強化研究結果，還將使用雙差分地震定位程式來計算精確的相對位置。預計這些結果將有助於愛琴海北部的常規地震定位，並有助於描繪在野外調查時所無法發現的海上發育不全的斷層。如果時間允許，此計劃也將以LOTOS的編碼進行走時的斷層逆推，來釐清該地區的地殼結構。 ;The tectonics of northern Aegean are affected by the westward push of the Anatolia plate and the gravitational spreading of the Aegean lithosphere that promote transtensional deformation in the area. As a result of these processes several destructive earthquakes occur in northern Aegean, the latest of them in June 2017 when a Mw 6.3 event caused extensive damage and one casualty in the island of Lesbos. This proposal aims at relocating a total of 6,700 events that were recorded in this area during 2011-2017 by stations of the Hellenic Unified Seismic Network (HUSN) and strong-motion sensors. First, a minimum 1D velocity model will be derived using the algorithm VELEST and constrained absolute locations will be obtained using NLLOC, a nonlinear probabilistic location code. In order to further enhance these results, precise relative locations will be also calculated using the doubledifference algorithm HYPODD. It is expected that these results will significantly help routine earthquake location in northern Aegean and will also contribute towards delineating seismogenic faults that lie offshore and cannot be detected by field studies. If time allows this work will also include a tomographic inversion of travel times using the code LOTOS, for the purpose of elucidating the crustal structure of the area.
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Department of Earth Sciences ] Research Project

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