Earthquake in Illinois could portend an emerging threat

Two seismologists at Washington University in St. Louis think the New Madrid Fault may have seen its day and the Wabash Fault is the new kid on the block. “I think everyone’s interested in the Wabash Valley Fault because a lot of the attention has been on the New Madrid Fault, but the Wabash Valley Fault could be the more dangerous one, at least for St. Louis and Illinois,” said Doug Wiens, professor of earth and planetary sciences in Arts & Sciences. “The strongest earthquakes in the last few years have come from the Wabash Valley Fault, which needs more investigation.”

3-D seismic model of vast water reservoir revealed

Eric ChouA slice through the earth, showing the attenuation anomalies within the mantle.A seismologist at Washington University in St. Louis has made the first 3-D model of seismic wave damping — diminishing — deep in the Earth’s mantle and has revealed the existence of an underground water reservoir at least the volume of the Arctic Ocean. The research, which analyzed 80,000 shear waves from more than 600,000 seismograms, provides the first evidence for water existing in the Earth’s deep mantle.