Dec. 4, 2012 — Research by Stanford scientists focuses on geologic features and activity in the Himalayas and Pacific Northwest that could mean those areas are primed for major earthquakes.
A big one in the Himalayas
The Himalayan range was formed, and remains currently active, due to the collision of the Indian and Asian continental plates. Scientists have known for some time that India is subducting under Asia, and have recently begun studying the complexity of this volatile collision zone in greater detail, particularly the fault that separates the two plates, the Main Himalayan Thrust (MHT).
Previous observations had indicated a relatively uniform fault plane that dipped a few degrees to the north. To produce a clearer picture of the fault, Warren Caldwell, a geophysics doctoral student at Stanford, has analyzed seismic data from 20 seismometers deployed for two years across the Himalayas by colleagues at the National Geophysical Research Institute of India.
The data imaged a thrust dipping a gentle two to four degrees northward, as has been previously inferred, but also revealed a segment of the thrust that dips more steeply (15 degrees downward) for 20 kilometers. Such a ramp has been postulated to be a nucleation point for massive earthquakes in the Himalaya.
Although Caldwell emphasized that his research focuses on imaging the fault, not on predicting earthquakes, he noted that the MHT has historically been responsible for a magnitude 8 to 9 earthquake every several hundred years.
"What we're observing doesn't bear on where we are in the earthquake cycle, but it has implications in predicting earthquake magnitude," Caldwell said. "From our imaging, the ramp location is a bit farther north than has been previously observed, which would create a larger rupture width and a larger magnitude earthquake."
Caldwell will present a poster detailing the research on Dec. 4 at the meeting of the American Geophysical Union in San Francisco.
Caldwell's adviser, geophysics Professor Simon Klemperer, added that recent detections of magma and water around the MHT indicate which segments of the thrust will rupture during an earthquake.
"We think that the big thrust vault will probably rupture southward to the Earth's surface, but we don't expect significant rupture north of there," Klemperer said. The findings are important for creating risk assessments and disaster plans for the heavily populated cities in the region.
Klemperer spoke about the evolution of geophysical studies of the Himalayas Dec. 3 at the same meeting in San Francisco.
Measuring small tremors in the Pacific Northwest
The Cascadia subduction zone, which stretches from northern California to Vancouver Island, has not experienced a major seismic event since it ruptured in 1700, an 8.7-9.2 magnitude earthquake that shook the region and created a tsunami that reached Japan. And while many geophysicists believe the fault is due for a similar scale event, the relative lack of any earthquake data in the Pacific Northwest makes it difficult to predict how ground motion from a future event would propagate in the Cascadia area, which runs through Seattle, Portland and Vancouver.
Stanford postdoctoral scholar Annemarie Baltay will present research on how measurements of small seismic tremors in the region can be utilized to determine how ground motion from larger events might behave. Baltay's research involves measuring low amplitude tectonic tremor that occurs 30 kilometers below Earth's surface, at the intersections of tectonic plates, roughly over the course of a month each year.
By analyzing how the tremor signal decays along and away from the Cascadia subduction zone, Baltay can calculate how ground motion activity from a larger earthquake will dissipate. An important application of the work will be to help inform new construction how best to mitigate damage should a large earthquake strike.
"We can't predict when an earthquake will occur, but we can try to be very prepared for them," Baltay said. "Looking at these episodic tremor events can help us constrain what the ground motion might be like in a certain place during an earthquake."
Though Baltay has focused on the Cascadia subduction zone, she said that the technique could be applied in areas of high earthquake risk around the world, such as Alaska and Japan. More
