Flexural fold structures and active faults in the northern–western Weihe Graben, central China

• 林, 愛明

• Rao, Gang

• Yan, Bing

抄録

Field investigations and analyses of tectonic topography related to late Pleistocene–Holocene activity of faults and fault-related flexural folds in the northern–western Weihe Graben, central China, reveal that: (1) four main active faults are present in the study area, the Beishan Piedmont Fault (BPF), the Kouzhen-Guanshan Fault (KGF), the Qishan-Mazhao Fault (QMF), and the Weihe Fault (WF), of which the BPF, KGF, and WF are normal faults whereas the QMF is a left-lateral strike-slip fault; (2) active flexural folds trending ENE–WSW are widely developed on the late Pleistocene–Holocene loess tablelands and alluvial fans, as well as on terrace risers; (3) vertical slip rates on the BPF, KGF, and WF are ∼0.5–1.1 mm/yr, and the left-lateral slip rate on the QMF is ∼1.5 mm/yr; and (4) a recent seismic faulting event with a magnitude (M) > 7 occurred in the past ∼3000 yr. Our results show that active faults and fault-related flexural folds are developing in the Weihe Graben under an ongoing extensional regime, with listric faulting occurring along pre-existing faults associated with the spreading of continental crust in intracontinental graben systems around the Ordos Block.

収録刊行物

• Journal of Asian Earth Sciences

  Journal of Asian Earth Sciences 114 (Part 1), 226-241, 2015-12

  Elsevier Ltd.

キーワード

• Active normal fault
• Strike-slip fault
• Flexural fold
• Listric fault model
• Weihe Graben
• Ordos Block

詳細情報

• CRID: 1050845760751718016
• NII論文ID: 120005704203
• NII書誌ID: AA11138796
• ISSN: 13679120
• HANDLE: 2433/204523
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles
  • KAKEN