کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4677851 | 1634823 | 2011 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Gently dipping normal faults identified with Space Shuttle radar topography data in central Sulawesi, Indonesia, and some implications for fault mechanics Gently dipping normal faults identified with Space Shuttle radar topography data in central Sulawesi, Indonesia, and some implications for fault mechanics](/preview/png/4677851.png)
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° to 18°. 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 ~ 30°. 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.
► Space-shuttle radar topography data were used to study active core complexes.
► Two corrugated, domal landforms were identified in central Sulawesi, Indonesia.
► Landforms are interpreted as denuded footwalls of active low-angle normal faults.
► Topographic transitions are interpreted as traces of extensional detachment faults.
► Fault footwalls dip 18° to 4°.
Journal: Earth and Planetary Science Letters - Volume 308, Issues 3–4, 15 August 2011, Pages 267–276