Japan scientists detect rare, deep-Earth tremor

Source: Yahoo News

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Using seismic equipment on land and on the seafloor that usually detects the Earth’s crust crumbling during earthquakes, researchers found something they had not detected before — a tremor known as an S wave microseism (AFP Photo/Adek Berry)

Miami (AFP) – Scientists who study earthquakes in Japan said Thursday they have detected a rare deep-Earth tremor for the first time and traced its location to a distant and powerful storm.

To view dictionary popup window put your cursor on the blue scripture words.
Earthquakes

“For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakesStrongs 4578: seismos, sice-mos´; from 4579; a commotion, i.e. (of the air) a gale, (of the ground) an earthquake:—earthquake, tempest.
Strongs 4579: eio, si´-o; apparently a primary verb; to rock (vibrate, properly, sideways or to and fro), i.e. (generally) to agitate (in any direction; cause to tremble); figuratively, to throw into a tremor (of fear or concern):—move, quake, shake.
, in diversStrongs 2596: kata, kat-ah´; a primary particle; (prepositionally) down (in place or time), in varied relations (according to the case (genitive, dative or accusative) with which it is joined): — about, according as (to), after, against, (when they were) x alone, among, and, x apart, (even, like) as (concerning, pertaining to touching), x aside, at, before, beyond, by, to the charge of, (charita-)bly, concerning, + covered, (dai-)ly, down, every, (+ far more) exceeding, x more excellent, for, from … to, godly, in(-asmuch, divers, every, -to, respect of), … by, after the manner of, + by any means, beyond (out of) measure, x mightily, more, x natural, of (up-)on (x part), out (of every), over against, (+ your) x own, + particularly, so, through(-oughout, -oughout every), thus, (un-)to(-gether, -ward), x uttermost, where(-by), with. In composition it retains many of these applications, and frequently denotes opposition, distribution, or intensity. places.”
Matthew 24:7

The findings, published in the US journal Science, could help experts learn more about the Earth’s inner structure and improve detection of earthquakes and oceanic storms.

The storm in the North Atlantic was known as a “weather bomb,” a small but potent storm that gains punch as pressure quickly mounts.

Groups of waves sloshed and pounded the ocean floor during the storm, which struck between Greenland and Iceland.

Using seismic equipment on land and on the seafloor that usually detects the Earth’s crust crumbling during earthquakes, researchers found something they had not detected before — a tremor known as an S wave microseism.

Microseisms are very faint tremors.

Another kind of tremor, known as P waves, or primary wave microseisms, can be detected during major hurricanes.

P waves are fast-moving, and animals can often sense them just before an earthquake hits.

The elusive S waves, or secondary waves, are slower, and move only through rock, not liquid. Humans feel them during earthquakes.

Using more than 200 stations operated by the National Research Institute for Earth Science and Disaster Prevention in Japan’s Chugoku district, researchers Kiwamu Nishida and Ryota Takagi “successfully detected not only P wave microseisms triggered by a severe and distant North Atlantic storm, known as a weather bomb, but also S wave microseisms, too,” said the study.

“The discovery marks the first time scientists have observed… an S wave microseism.”

Microseism S waves are so faint that they occur in the 0.05 to 0.5 Hz frequency range.

The study in the journal Science details how researchers traced the direction and distance to the waves’ origins, and the paths they traveled.

The discovery “gives seismologists a new tool with which to study Earth’s deeper structure,” said Peter Gerstoft and Peter Bromirski of the University of California, San Diego in an accompanying Perspective article.

Learning more about microseismic S waves may “add to our understanding of the deeper crust and upper mantle structure.”

  1. dale langmade, 12 September, 2016

    Just a note for those who follow science fiction: Page 218 of Greg Bear’s ‘The Forge of God’ has this dialogue between scientists: “… really unusual microseisms , like something burrowing. Right in the Ramapo Deep. What could that be?” “… a plug of superdense matter, probably a black hole. Hitting the ocean nearby, falling to the Ramapo Deep, voila! Burrowing.”

    The book concerns an attempt by space alien robots to destroy the Earth. In the book the President of the United States gets the notion that God is not pleased in the manner in which we are evolving and sends the space aliens to destroy us so that He may start over. He coins the term “Forge of God” which becomes a religious movement.

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