Tag Archives: seismic
Seismic unrest: New earthquake swarm starts on La Palma, Spain – Over 300 quakes hit mid-Atlantic Azores Islands, Portugal – Are volcanoes waking up there?
Seismic unrest is being reported since last Saturday, February 10, 2018 with a new earthquake swarm starting in the southeast of the island of La Palma in Spain. Now, on February 12, 2018 more than 300 small earthquakes have rattled the mid-Atlantic Azores Islands overnight.
Seismic unrest continues at Bogoslof volcano. Scientists are watching the eruption around the clock — even though monitoring stations are far from the site.
Chris Waythomas, of the U.S. Geological Survey, is observing a particular indication of increased seismic activity: volcanic tremors.
“You can think of it as the sort of signal you might get if you were to seismically monitor an organ pipe,” Waythomas said. “As air moves through the pipe, it resonates. When it impinges on the pipe, it produces motion and that’s what we’re kind of measuring.”
Waythomas said the problem is there’s a lot of wind and that can obscure the signal.
“It looked to us like there was increase in this tremor signal,” Waythomas said. “We wanted to alert everyone it was (more…)
In Southern California, scientists listening to rumblings deep underground found seismic activity at deeper-than-expected levels, and it may signal new earthquake extremes, according to a new study.
Deeper or smaller seismic activity can be very difficult to monitor, especially in urban areas, due to the distance between seismicity monitors and the noise caused by traffic and industry. In order to better see these so-called micro signals, a group of researchers temporarily deployed detectors along the Newport-Inglewood fault (NIF), which stretches nearly 50 miles (80 kilometers), from Culver City to Newport Beach, in Southern California.
“It’s very helpful for us to do these kinds of studies where the seismic risk is high (more…)