Assessment of Crustal Thinning and Tectonic Stress Distribution of Gülbahçe Fault Zone and Its Surroundings (İzmir, West Turkey) Using Gravity and Magnetic Anomalies

IF 0.5 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Bulletin of the Mineral Research and Exploration Pub Date : 2021-11-27 DOI:10.19111/bulletinofmre.1029265

O. Pamukçu, Ayça Çırmık, F. Doğru, Ece Ünlü, Barış Can Malaliçi

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Abstract

Gülbahçe Fault Zone (GFZ) is a significant tectonic structure and seismic source for İzmir city and its surroundings. The major earthquakes occurred at the surroundings of GFZ are 2005 Seferihisar, 2020 Samos Island-Aegean Sea and 2021 Seferihisar earthquakes. In this study, the crustal thinning and tectonic stress distribution of GFZ and its surroundings were analyzed by using the new gravity and magnetic data. The correspondence analysis was applied by appraising together the magnetic and free-air anomaly data. Moreover, the average density of the subsurface structure was calculated by applying the Parasnis method. The deviatoric stress calculation was executed and the change of the physical properties that controls the gravity and magnetic anomaly of the crustal structure of the GFZ and its surroundings from north to south was investigated. Therefore, the average density values, which were obtained from gravity anomalies, were computed as 2.59 gr / cm 3 in the north of the study region and it decreased to 2.06, 1.8 and 1.49 gr / cm 3 towards to the south. The free-air gravity anomaly values were between 0-70 mGal and the magnetic anomalies were between -450-150 nT. The deviatoric stress

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利用重磁异常评价土耳其西部g lbahe断裂带及其周围(İzmir)地壳减薄及构造应力分布

Gülbahçe断层带（GFZ）是伊兹密尔市及其周边地区的重要构造和震源。GFZ周围发生的主要地震有2005年塞费里希萨尔地震、2020年爱琴海萨摩斯岛地震和2021年塞费里希萨尔地震。利用新的重磁资料，分析了GFZ及其周围地区的地壳减薄和构造应力分布。应用对应分析法对地磁和自由空气异常资料进行了综合评价。此外，应用Parasnis方法计算了地下结构的平均密度。进行了偏应力计算，研究了控制GFZ及其周围地壳结构重磁异常的物理性质从北到南的变化。因此，从重力异常中获得的平均密度值在研究区域的北部被计算为2.59 gr/cm3，而在南部则分别降至2.06、1.8和1.49 gr/cm 3。自由空气重力异常值在0-70mGal之间，磁异常值在-450-150nT之间

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来源期刊

Bulletin of the Mineral Research and Exploration GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

1.20

自引率

20.00%

发文量

审稿时长

10 weeks

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