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originally posted by: muzzy
Now see how many questions that list raises, how many potential maps, graphs and summaries there can be ............
take the top spot, NEAR AMAMI-OSHIMA ISLAND, which is between Okinawa and Kyushu, all those quakes, and the biggest one was only a M5.1!
mag1= 1778 , mag2= 635 , mag3= 74 , mag4= 11 , mag5= 1
when did the 5.1 occur in the timeline?, where those others aftershocks or just normal background seismicity?
something for another day .....
too bad Bing only will show 200 icons/markers, (as does the new Google mapping system) it kind of limits what I can do now. I can still do static maps over 200 though.
The next slow-slip event is expected to begin sometime this fall or winter. The Cascadia fault and the one responsible for Nepal’s devastation are both boundaries where tectonic plates collide. In Nepal, the Indian subcontinent is being forced under Central Asia, while in the Northwest, the seafloor is diving — or subducting — under North America. Even though the faults aren’t identical, geologists say the Cascadia analysis could help improve the broader understanding of when and how such plate boundaries rupture, generating some of the world’s most powerful quakes.
For the study published Monday in the journal Nature Geoscience, UW geophysicist Heidi Houston analyzed tens of thousands of faint tremors under Washington’s Olympic Peninsula and Vancouver Island between 2007 and 2012. The tiny quakes occur when tectonic plates slip slowly past each other 20 miles or more underground. These slow-slip events last for several weeks and can propagate 100 miles or more north and south. The pattern repeats roughly every 12 to 14 months.
Scientists and self-styled seers alike have long been intrigued by a possible link between earthquakes and gravitational and tidal forces, said UW earth sciences professor Ken Creager, who was not involved in Houston’s study.
The idea is that fluctuating tidal forces should raise and lower the strain on faults, causing them to snap. But despite decades of study, the impact on regular quakes has proved negligible. Creager and his colleagues were among the first to show that the story is very different with slow slip. They found a clear link between tremor rates and tide cycles in the complex topography of the Pacific Northwest.
During some phases, the minute changes in pressure encourage tremor; during other phases, tremor is inhibited. Houston delved into the data in more detail and found that when a portion of the fault first begins to slip, it’s not very sensitive to tidal effects. But as the tremor continues over several days, the fault weakens and the tidal pull becomes a much more dominant factor. “We think the stress causes the fault to start slipping faster,” Houston said
originally posted by: muzzy
a reply to: Eagleyedobserver
Japan has an earthquake on average every 8 minutes 51 seconds, based on 26/08/2015 data.
New Zealand every 22 minutes 51 seconds ( same date basis)