scholarly journals Effects of Complexity of Fault Rupture Process on Strong Ground Motions and Extraction of the Dominant Parameters

2008 ◽  
Vol 60 (4) ◽  
pp. 253-265 ◽  
Author(s):  
Motofumi WATANABE ◽  
Hiroyuki FUJIWARA ◽  
Toshiaki SATO ◽  
Toru ISHII ◽  
Takashi HAYAKAWA
Keyword(s):  
Ground Motions ◽  
Rupture Process ◽  
Fault Rupture ◽  
Strong Ground Motions ◽  
Strong Ground

scholarly journals The Quaternary Active El Arrayan Fault, Santiago, Chile

2021 ◽  
Vol 48 (3) ◽  
Author(s):  
Jose Araya ◽  
Gregory P. De Pascale ◽  
Sergio Sepúlveda
Keyword(s):  
Active Fault ◽  
Ground Motions ◽  
Hanging Wall ◽  
Local Source ◽  
Fault Rupture ◽  
Fault Rocks ◽  
Strong Ground Motions ◽  
The North ◽  
The City ◽  
Strong Ground

Understanding the location and nature of Quaternary active crustal faults is critical to the reduction of both fault rupture and strong ground motions hazards in the built environment. Recent work along the San Ramon Fault in Santiago, Chile demonstrates that crustal seismic sources are important hazards. We present the results of a second likely Quaternary active fault (the El Arrayan Fault, EAF) that runs through the City of Santiago. The EAF was discovered at an outcrop in El Arrayan (Lo Barnechea) with up to the North reverse motion and sinistral (left-lateral) motion clearly visible and coincident with fault rocks (gouge, cataclasite, and breccia) and higher topography (i.e. uplift) in the hanging wall. The EAF is at least 12 km long, strikes North-Northwest to South-Southeast, and is steeply dipping (mean dip 77º NE). Clear geomorphic expression with sinistral displaced streams (up to ~210 m) suggest that this fault is Quaternary active and an important local source of fault rupture and crustal strong ground motions. Because no fault zone avoidance criteria in Chile, there is need for enhanced fault mapping, legislation, implementation of active fault rupture avoidance areas in Chile to reduce the risk posed by active crustal structures.

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