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Earthquake Thread ~ Always Updated
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[quote:Anonymous Coward 31288136:MV8yMzkxMDE5XzYyNzEwOTQ2XzkxOTVGQjUx] [b]A M~8.3 Chile earthquake has become more likely[/b] Since 22 April 2017, an earthquake swarm has been in progress offshore the port city of Valparaíso, which has been widely felt in Chile’s capital, Santiago. This sequence began with a M=6.0, and was followed two days later on 24 April, by a M=6.9 earthquake in the same swarm cluster. What are the implications of the swarm, in light of historical earthquakes in the region, for what may happen next? [b]Geological Disneyland[/b] Large mega thrust earthquakes are one of three dramatic consequences of the ‘Nazca’ oceanic plate being shoved under the South American continent at about 80 mm/yr (3 in/yr). The second consequence of this ‘subduction’ is the compression and uplift of the Andes, and the third is the string of Pacific rim volcanoes. The Chilean coastline has suffered repeated great earthquakes over the 500 year or so of its recorded history. The largest earthquake ever recorded, a M=9.5 in 1960, occurred 570 km (350 mi) south of Santiago in southern Chile. So, while coastal Chile is subject to earthquakes, Eastern Chile, along its frontier with Argentina, to eruptions. [b]How big could the next shock be?[/b] This week’s seismic swarm struck in the center of a 300-km-long span of the mega thrust hemmed in by two recent great quakes. In 2010, the M=8.8 Maule earthquake ruptured the region to the south, and in 2015, the M=8.3 Illapel earthquake ruptured to the north (Melgar et al., 2016). The last large earthquakes to have occurred within this span were in 1971 (M=7.9) and 1985 (M=8.0), and so 50-60 years have since elapsed. Because the long term subduction, or slip rate on the mega thrust, is about 80 mm/yr, a deficit of roughly 4-5 m of slip has accumulated. If a 300 km x 100 km section of the mega thrust suddenly slipped 4-5 m (12-16 ft), that would yield a M~8.3 shock. That’s roughly equivalent to, or a bit larger than, adding the 1971 and 1985 shocks. http://temblor.net/earthquake-insights/a-m8-3-chile-earthquake-has-become-more-likely-3261/ [/quote]
Original Message
I accidentally deleted the OP of this thread during some glitch issues on GLP this morning (10/30/17).
I will be posting some useful links in the next post to make it easier for those posting so you don't have to scroll through a massive OP. :)
I had to delete the first two comments on this thread to do so, but wanted to keep them so I've put them below.
5* and I'm on board.. Simple.. I'm sorry about CH.. He will be missed greatly..
but, the continuation of EQ is an important thing because it's connected to so many things..
Thank you!!! Simple... I will be here.....
Quoting:
4thhorseman
Awesome Simple, glad you started this thread. Lets get to work.
Quoting:
Anonymous Coward 2911653
I also would like to mention that I know this thread has MANY pages and that it can be somewhat intimidating to join/chime in on a long standing thread as a new member/AC (I've experienced it when I first joined GLP), but we are a VERY welcoming group to those who newly join us. We are a small family of sorts who are all mostly interested in the same earth-related topics (quakes/solar/volcanoes/weather/etc.) and share info on each of those topics as well as 'off-topic' discussions. We genuinely care for one another here and even when we do not agree with each other, we ALWAYS respect each other.
I truly enjoy when new folks join us here. All that I ask is to show respect. :)
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