Skip to Main Content
Book Chapter

Fault systems of the eastern Indonesian triple junction: Evaluation of Quaternary activity and implications for seismic hazards

By
Ian M. Watkinson
Ian M. Watkinson
SE Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK
Search for other works by this author on:
Robert Hall
Robert Hall
Search for other works by this author on:
Published:
January 01, 2017

Abstract

Eastern Indonesia is the site of intense deformation related to convergence between Australia, Eurasia, the Pacific and the Philippine Sea Plate. Our analysis of the tectonic geomorphology, drainage patterns, exhumed faults and historical seismicity in this region has highlighted faults that have been active during the Quaternary (Pleistocene to present day), even if instrumental records suggest that some are presently inactive. Of the 27 largely onshore fault systems studied, 11 showed evidence of a maximal tectonic rate and a further five showed evidence of rapid tectonic activity. Three faults indicating a slow to minimal tectonic rate nonetheless showed indications of Quaternary activity and may simply have long interseismic periods. Although most studied fault systems are highly segmented, many are linked by narrow (<3 km) step-overs to form one or more long, quasi-continuous segment capable of producing M > 7.5 earthquakes. Sinistral shear across the soft-linked Yapen and Tarera–Aiduna faults and their continuation into the transpressive Seram fold–thrust belt represents perhaps the most active belt of deformation and hence the greatest seismic hazard in the region. However, the Palu–Koro Fault, which is long, straight and capable of generating super-shear ruptures, is considered to represent the greatest seismic risk of all the faults evaluated in this region in view of important strike-slip strands that appear to traverse the thick Quaternary basin-fill below Palu city.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Geohazards in Indonesia: Earth Science for Disaster Risk Reduction

P. R. Cummins
P. R. Cummins
Australian National University, Australia
Search for other works by this author on:
I. Meilano
I. Meilano
Bandung Institute of Technology, Indonesia
Search for other works by this author on:
The Geological Society of London
Volume
441
ISBN electronic:
9781862399709
Publication date:
January 01, 2017

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal