Lecture 14 Oblique subduction in Sumatra. A few other examples of oblique subduction.

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Presentation transcript:

Lecture 14 Oblique subduction in Sumatra

A few other examples of oblique subduction

aseismic Outer arc ridge In Sumatra, the set up is about like this seismic

aseismic Outer arc ridge seismic Is the Sumatran fault there because of the volcanic arc?

Sure looks like a possibility

Probably not!

Strain is partitioned almost completely between the megathrust and the Sumatran fault

Larger events Smaller events

The Sumatran fault is highly segmented Past fault ruptures were influenced by 1-5 km stepovers along the fault

Are slip rates constant along the 1600-km fault?

Toba

Age of Toba Tuff is 70,000 years old SLIP RATE= 27mm/y N

Maninjou

27 mm/yr 11 mm/yr

North, Central and Southern Domains

What is the total offset? And what does that imply about the evolution of the fault?

Geological offsets are 20 km 1967) Redrawn from Katili & Hehuwat

The largest geomorphic offset is ~20 km

Total extension in the Sunda region ~100 km since Upper Pliocene

The present kinematics of the Sumatran fault system

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