Blog Posts Tagged "Subduction"

Geek Blog, entry 1: Some of the science behind my Leg 352 participation....

So, why am I, a seriously land-loving geologist on this ship? Because I have spent my career examining rocks and processes associated with subduction.

Houston, we've landed on….Boninite

Our entire mission is dependent on seismic data and our interpretation of it. We can be wildly off, or spot on with what we think we’ll encounter during drilling. It’s a highly educated guess, but what worried many members of the team was drilling through too much sediment before they hit the hard rock.

What is a subduction zone?

Incoming! Oblique Subduction at the Sunda Subduction Zone

The Indian and Australian Plates plow northeast into the Sumatra subduction zone, part of the larger Sunda subduction zone, at a speed of 45 mm/yr. The angle between the direction these two plates move relative to each other is not always at a right angle (90°) to the subduction zone itself--here it is about 50°. Sliding under the Sunda Plate at an angle is not easy, so several large strike-slip fault systems help to accommodate some of this movement. If you thought learning vectors in high school was pointless—think again. This is a perfect vector component problem!

Not So Fast! Types of earthquakes at the Sumatra Seismogenic Zone

Several different types of earthquakes and fault-slip events happen at the Sunda subduction zone and other subduction zones around the world. Typical earthquakes usually last a few seconds to a few minutes, if they have very large magnitude. But not all fault slip results in typical earthquakes.

Taking the Pulse of Subduction: Dr. Fryer