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Tectonics and crustal stresses in Yatsushiro Sea and its relation to the causative faults of the 2016 Kumamoto earthquakes.
Published in Ömer Aydan, Takashi Ito, Takafumi Seiki, Katsumi Kamemura, Naoki Iwata, 2019 Rock Dynamics Summit, 2019
M. Yagi, I. Sakamoto, Ö. Aydan
The Kyushu area is characterized by east-west transpression accompanying the subduction of the Philippine Sea plate in the northwest direction and transtension of Beppu-Shimabara Graben in central Kyushu to the north and south. In Shikoku and Kyushu, Ikeda et al (2009) pointed out pull-apart basin formation by step-over along Median Tectonic Line Active Fault System (MTLAFS), and almost MTLAFS stress condition has a transpression sense.
Origin and depositional environment of oils and sediments in the Cretaceous Deep-Water Tano Basin, Ghana: Constraints from biomarkers
Published in Petroleum Science and Technology, 2022
Rabiatu Abubakar, Kofi Adomako-Ansah, Solomon Adjei Marfo, Judith Ampomah Owusu, Clifford Fenyi
The Tano Basin was formed as a result of the Atlantic rift system, and this began in the late Jurassic Period and resulted in the Transform Margin of West Africa. The Tano Basin, a pull-apart basin between the Romanche and St. Paul transform faults, formed as a result of active rifting and subsidence during the Cretaceous Period. This basin has been identified as an important hydrocarbon-prone zone (Tetteh 2016; Adda 2013). The Tano Basin has three major play systems: the Albian, the Cenomanian, and the Turonian. The confining mechanism of hydrocarbon is both structural and stratigraphic. For most of the fields in the Basin, the reservoir rock is sandstone and the seal is shale. The palynostratigraphy of the Tano Basin was carried out by Atta-Peters et al. (2013) using onshore data from wells to the north of the study area to determine the stratigraphy of the basin, as shown in Figure 2.
Seismic hazard assessment of the central North Anatolian Fault (Turkey) from GPS-derived strain rates and b-values
Published in Geomatics, Natural Hazards and Risk, 2018
Asli Dogru, Ethem Gorgun, Bahadir Aktug, Haluk Ozener
According to the GPS velocity field, there is no deformation at Sungurlu fault (SF). However, strain has been accumulating where the SF and main NAF merge (Yavasoglu 2015). From the GPS results, such tectonic movements relatively oblique to the NAF imply that this fault does not strictly obey a model of an intracontinental transform fault, along which the upper crustal block motions must be parallel to its trace (Dhont et al. 1998). A number of basins occur within the NAF. One of them is the Niksar basin, which lies between the 1939 (M 7.9) and 1942 (M 7.1) earthquake fault segments of the NAF and does not present pure strike-slip movement (Tatar et al. 1995; Tatar 1996). Barka et al. (2000) suggest that the high-strain/low b-value area identified in this study has a distinct morphological expression of these basins. The results of Karasozen et al. (2013) also reveal that the Niksar-Erbaa pull-apart basin indicates localized extension due to transtension with notable spatial variations in the stress state. According to Yolsal-Çevikbilen et al. (2012), the lack of correlation and distributed seismicity along several segments of the NAF in this region might be an indicator of an interseismic stage, during which the strain energy is accumulating along locked portions of the fault.