Earthquakes have a well-known and easily recognizable connection to volcanoes. The sudden onset of ground shaking can indicate near-term or imminent volcanic activity. Volcanic tremors, however, are difficult to detect. These are semi-continuous seismic or acoustic signals, or both, that continue for just a few seconds or persist for a year or more. They, like earthquakes, carry […]
ALLISON LAKE, ABOVE VALDEZ — Three men dressed in full raingear crept like ants across a bumpy green landscape on Aug. 25, 2023. Using a metal pole that was part of a boat frame, together they lugged a four-stroke outboard motor that seemed to float above the wet greenery. The three men were scientists who […]
Sensors that detect changes in atmospheric pressure due to ground shaking can also obtain data about large earthquakes and explosions that exceed the upper limit of many seismometers, according to new research. The sensors, which detect inaudible infrasounds carried through the air, could improve tsunami warnings and other emergency responses while also lowering costs. Research […]
According to USGS, four earthquakes occurred scant hours apart near and along the Aleutian Arc, the seismically active zone that rings the Gulf of Alaska from the Western Aleutian Islands to the east of Prince William sound. The first of the morning in this region occurred to the north of the arc in the Novarupta […]