A rare earthquake in August 2021 wasn't two major ruptures as originally thought, but five—with one powerful and shallow enough to trigger a multi-ocean tsunami
South Georgia Island's historic whaling stations, like this one at Grytviken, have been abandoned, but the British Antarctic Survey maintains a research station at King Edward Point. The South Sandwich Islands, meanwhile, are currently uninhabited. There is no geophysical monitoring station on these islands and no ocean-bottom seismometers, making earthquakes there difficult to study.
Deep below the isolated South Sandwich Islands, the South American tectonic plate plunges beneath the South Sandwich plate at a modest speed of 2.8 inches a year. The uneven grind between these two plates causes stress to build up over time. Sometimes that stress is released in earthquakes—including the kind that can generate tsunamis.
“In a first-order sense, this is a single earthquake,” Hicks says. It was just complicated—and powerful. “It ruptured the vast proportion of this subduction zone.” The third rupture in the rock, however, sandwiched between the other four, stood out. Registering as a magnitude 8.2 event, it was extremely powerful, unleashing the majority of the entire five-part quake’s energy. It was also slow, taking 180 seconds to transpire. That was partly why it remained hidden for so long: The team wasn’t using the right kind of seismic searchlight.
Brasil Últimas Notícias, Brasil Manchetes
Similar News:Você também pode ler notícias semelhantes a esta que coletamos de outras fontes de notícias.
Republicans plan to boycott Senate panel voting session on Fed nominees, source saysRepublicans plan not to attend a meeting scheduled for 2:15 p.m. (1915 GMT) scheduled by committee Chairman Sherrod Brown to vote on the five nominees to the Fed's Board of Governors, including whether to recommend Jerome Powell for a second term as the U.S. central bank's chair, the person said. While most Republicans on the panel back Powell, they appear unified in their objection to Sarah Bloom Raskin's nomination as vice chair for supervision, the top U.S. banking regulatory role.
Consulte Mais informação »
Open Source, What the Heck is That? | HackerNoonProgrammers who have access to source code can change a program by adding to it, changing it, or fixing parts of it that aren’t working properly.
Consulte Mais informação »
'Invisible' earthquake caused mysterious 2021 tsunami, scientists findSome tsunami-generating earthquakes are invisible to our monitoring systems.
Consulte Mais informação »
Body found after plane with 8 aboard crashes into ocean near N.C.’s Outer Banks“We have no indication that anyone survived the crash,” the Carteret County sheriff said.
Consulte Mais informação »