Comparing geologic structural mapping techniques in tectonically active region of Lake Van using gravity and seismological data

Doğan, Mustafa Berkay; Sayın, Tuba Sönmez

doi:10.1007/s11600-023-01153-x

Artykuł - szczegóły

Tytuł artykułu

Comparing geologic structural mapping techniques in tectonically active region of Lake Van using gravity and seismological data

Autorzy

Doğan Mustafa Berkay , Sayın Tuba Sönmez

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-023-01153-x

Warianty tytułu

Języki publikacji

Abstrakty

The Van Lake region is situated within the boundary of the collision zone between the Arabian and Eurasian plates, which has resulted in the formation of a variety of geological structures, including faults, volcanoes, and uplifted mountain ranges. A comprehensive understanding of these structures can yield significant information pertaining to the region’s tectonic history, as well as potential tectonic hazards. In the present study, several structural mapping techniques, including lineament detection techniques [Horizontal Gradient Magnitude (HGM), Analytic Signal (AS), and Tilt Angle] and curvature analysis attributes (Differential, Gaussian, Mean, and Shape Index), were analyzed and compared the results obtained using both Earth Gravity Model 2008 (EGM2008) Bouguer gravity and seismological data, with the goal of determining the most effective (suitable) edge detection method in order to gain a better understanding of high-stress regions and areas of potential seismic hazard in the vicinity of Van Lake. It is of great importance to investigate the behavior of faults and the curvatures of structural features within the crust, as they play a significant role in determining the distribution of stress, and subsequently, its impact on surface structures. The results show that HGM and AS are effective in defining fault strikes and trends, while Gaussian curvature attributes can detect lineaments and structural edges. Differential curvature attributes were found to be best suited for complex tectonic regions. The study also reveals a coherent relationship between fold orientation and fault strikes with the regional principal stress direction. The current study has focused on a region characterized by a significant negative anomaly, which appears to be a valley-like fold structure with a highly inclined interlimb angle. This area, referred to as the “silent” zone, is seismically quiet with regard to earthquakes and faults. However, focal mechanism results support the orientation of the interlimb angle fold in the vicinity of this region. The existence of a strong negative anomaly in the eastern part of the study area highlights the requirement for additional geological field observations and seismic surveys to evaluate the potential earthquake hazards. In the course of comparing various structural mapping techniques, it was concluded that the application of second-order vertical derivative of gravity potential is a suggested approach for identifying the edges of causative structures.

Słowa kluczowe

curvature analysis Lake Van lineament detection techniques structural mapping EGM2008 Bouguer anomalies

analiza krzywizny jezioro Wan techniki wykrywania lineamentu mapowanie strukturalne

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2024

Tom

Vol. 72, no. 3

Strony

1587--1600

Opis fizyczny

Bibliogr. 72 poz.

Twórcy

autor

Doğan Mustafa Berkay

doganmus@itu.edu.tr

General Directorate of Mineral Research and Exploration, 06800 Ankara, Turkey

https://orcid.org/0000-0002-5889-5439

autor

Sayın Tuba Sönmez

Kocaeli University, 41380 Kocaeli, Turkey

https://orcid.org/0000-0003-0266-2596

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Bibliografia

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