Indonesian Region – Tectonic ElementsIndonesian Region – Tectonic Elements

Indonesian Region – Earthquake Hypocenters Indonesian Region – Earthquake Hypocenters (since 1973)(since 1973)

Epicenter for M=9.0 event Dec 26, 2004

INDONESIAN REGION TECTONIC ELEMENTS &

PORPHYRY DEPOSITS

INDONESIAN REGION TECTONIC ELEMENTS &

PORPHYRY DEPOSITS

30o

40o

55o

65o>70o

EQ<300kmEQ

>600km

Toba

Krakatoa

Martabe

Slab topologies confirmed by tomographic imaging

RooRise

55o

65o

500 km

(Modified from McCaffrey, 1988)

2 - 3 mm/yr E-W extension on strike-slip faults.

Hypocenter depths < 30 km

N15oE subduction at 7 cm/yr.

BANDA ARC, INDONESIABANDA ARC, INDONESIA EARTHQUAKE FAULT PLANE SOLUTIONSEARTHQUAKE FAULT PLANE SOLUTIONS

Batu Hijau

Elang

Simplified Geology of SumbawaSimplified Geology of Sumbawa Differential Differential

ExhumationExhumation

Elang

Hu’ u

Soripesa

Most uplifted

Western block

Central block

Eastern blockLeast uplifted

Chronology of Map Units in Chronology of Map Units in SumbawaSumbawa