Gently dipping normal faults identified with Space Shuttle radar topography data in central Sulawesi, Indonesia, and some implications for fault mechanics

被引:34
作者
Spencer, Jon E. [1 ]
机构
[1] Arizona Geol Survey, Tucson, AZ 85701 USA
关键词
Sulawesi; detachment fault; core complex; critical taper; extensional tectonics; SRTM; METAMORPHIC CORE COMPLEX; LOW-ANGLE; TECTONIC EVOLUTION; EXTENSION; ARIZONA; SEISMICITY; ROTATION; ORIGIN; RIDGE;
D O I
10.1016/j.epsl.2011.06.028
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Space-shuttle radar topography data from central Sulawesi, Indonesia, reveal two corrugated, domal landforms, covering hundreds to thousands of square kilometers, that are bounded to the north by an abrupt transition to typical hilly to mountainous topography. These domal landforms are readily interpreted as metamorphic core complexes, an interpretation consistent with a single previous field study, and the abrupt northward transition in topographic style is interpreted as marking the trace of two extensional detachment faults that are active or were recently active. Fault dip, as determined by the slope of exhumed fault footwalls, ranges from 4 degrees to 18 degrees. Application of critical-taper theory to fault dip and hanging-wall surface slope, and to similar data from several other active or recently active core complexes, suggests a theoretical limit of three degrees for detachment-fault dip. This result appears to conflict with the dearth of seismological evidence for slip on faults dipping less than similar to 30 degrees. The convex-upward form of the gently dipping fault footwalls, however, allows for greater fault dip at depths of earthquake initiation and dominant energy release. Thus, there may be no conflict between seismological and mapping studies for this class of faults. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:267 / 276
页数:10
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