Fault plane solutions in the Aegean sea and the surrounding area and their tectonic implication-猫眼课题宝

爱琴海及周边地区断层解及其构造意义

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1998

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作者：

B. Papazachos;E. Papadimitriou;A. Kiratzi;C. Papazachos;E. Louvari

利用1953年至1995年在爱琴海及其周边地区(34°N43°N，18°E-30°E)发生的12 7次M≥5.5级、浅层震源深度(h&lt；60 km)地震的断层面解，研究了该区的活动构造。这些地震震源的地理分布和断层面解的相似性导致识别出35个空间丛集，进而划分出5个具有相似地震构造性质的地震带。第一个带覆盖阿尔巴尼亚西部和希腊西部的沿海地区，其特点是与海岸线平行的低角度逆冲断层(走向：ξ=32°，倾角：δ=32°，倾角：λ=90°)。这种狭窄的逆冲推覆带归因于欧亚板块和亚得里亚海板块之间的大陆-大陆碰撞。第二条带也是逆冲型的，沿着希腊弧凸面延伸(赞特以西至罗多斯以西)。该带断裂走向约为NW向(ξ=3 10°，δ=2 4°，λ=10 2°)，可归因于东地中海大洋岩石圈(非洲板块前部)的俯冲和后期爱琴海板块向东地中海岩石圈的逆冲。第三个带是一个非常宽的张力带，覆盖了爱琴海的大部分和部分邻近的陆地(大陆东部和希腊北部、土耳其西部、保加利亚南部、前南斯拉夫南部)。该带正断层走向约为东西向，倾角约为45°。这种断裂作用归因于内部变形，可能是由扩张区的重力塌陷引起的。第四条带也是张性的，但这里的断层大约沿着N-S方向走向。这条带从阿尔巴尼亚开始于北部，沿着希勒尼德斯山山脉一直到伊皮鲁斯东部，然后可能被中断，并在伯罗奔尼撒南部通过克里坦海槽到罗多斯再次被发现。这条带变形的原因仍然是个问题。39，N.3，第199-218页；1998年9月，Bollettino DI Geofisica Teorica ed APPLICATA通讯作者：B.C.Papazachos；塞萨洛尼基亚里士多德大学地球物理实验室，塞萨洛尼基，GR 54006，希腊；电话：00 30 31 998486；电子邮件：ritsa@Geo.auth.gr©1998OsServatorio Geofisico Sarmentale

Fault plane solutions for 127 earthquakes, of magnitude M ≥ 5.5 and shallow focal depth (h< 60 km), which occurred in the Aegean Sea and surrounding area (34°N43°N, 18°E-30°E) during the period 1953-1995, are used to investigate the active tectonics. The geographic distribution of the foci of these earthquakes and the similarity of the fault plane solutions led to the identification of 35 spatial clusters, which in turn define five seismic belts of similar seismotectonic properties. The first belt covers the coastal area of western Albania and western Greece, and is characterized by low angle thrust faults that strike parallel to the coastline (strike: ξ = 328°, dip: δ = 32°, rake: λ = 90°). This narrow zone of thrusting is attributed to the continent-continent collision between the Eurasian and Adriatic plates. The second belt is also of thrust type and extends along the convex side of the Hellenic arc (west of Zante to west of Rhodos). Faults of this belt have an approximately NW strike (ξ =310°, δ = 24°, λ = 102°) and are attributed to subduction of the eastern Mediterranean oceanic lithosphere (front part of the African plate), and postienlarly to overthrusting of the Aegean plate onto the eastern Mediterranean lithosphere. The third belt is a very wide tensional one and covers most of the Aegean Sea and parts of the adjacent lands (eastern mainland and northern Greece, western Turkey, southern Bulgaria, southern former Yugoslavia). Normal faults in this belt strike in an approximately E-W direction and their dip angles are of the order of 45°. This kind of faulting is attributed to internal deformation, probably caused by gravitational collapse of the expanding area. The fourth belt is also tensional, but faults here strike in an approximately N-S direction. This belt starts in the north from Albania, follows the Hellenides Mountain Range down to eastern Epirus, then is probably interrupted, and is identified again in the southern Peloponnese through the Cretan trough to Rhodos. The cause of deformation in this belt is still a matter VOL. 39, N. 3, pp. 199-218; SEPTEMBER 1998 BOLLETTINO DI GEOFISICA TEORICA ED APPLICATA Corresponding author: B. C. Papazachos; Geophysical Laboratory, Aristotle University of Thessaloniki, Thessaloniki GR 54006, Greece; tel. 00 30 31 998486; e-mail: ritsa@geo.auth.gr ©1998 Osservatorio Geofisico Sperimentale

Fault plane solutions in the Aegean sea and the surrounding area and their tectonic implication

爱琴海及周边地区断层解及其构造意义

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