Earthquakes

star gazer · 17-02-2018 11:36AM #1

Around the world, there are several hotspots for earthquake activity that can at times cause huge damage from the Pacific ring of fire to Iceland. The destructive power of Tsunamis triggered by earthquakes was shown in recent years in Japan (2011) and Indonesia (2004).
Seismic activity can also be a precursor of volcanic events.
Mexico 7.2 magnitude earthquake
Off the North of Iceland Iceland earthquake activity

star gazer · 19-02-2018 10:16PM

Up to a 5.2 magnitude under the seabed just North of Iceland. vedur

At 05:38 UTC this morning an earthquake of magnitude M5.2 occurred 14 km ENE of Grey. It was felt widely in the Northern part of the country. Five more earthquakes with magnitude between 4-4.9 were detected over the past night. The earthquakes originate from the so-called Grey oblique rift zone in the northern Skandadjúp basin within the Tjörnes fracture zone. The earthquakes from this swarm originate at an average of around 10 km depth and the focal mechanism of the largest earthquake indicates normal faulting on a northerly striking fault.
...
The closest continuous GPS station located on Grey does not show any visible deformation that might indicate magmatic intrusion. This, together with the depth of the earthquakes, suggests that the current seismic activity is most likely related to tectonic processes at a divergent plate boundary, and not related to the movement or accumulation of magma.
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Fathom · 24-02-2018 12:34AM

Comparatively, California has hundreds of recent earthquakes. Such is normal.

Black Swan · 25-02-2018 12:01AM

Fathom wrote: »

Comparatively, California has hundreds of recent earthquakes. Such is normal.

Indeed!

star gazer · 25-02-2018 05:30PM

Some broader earthquake maps:
EMSC Mediterranean map (it also has a world map)
USGS global earthquake map

Black Swan · 25-02-2018 06:30PM

Plate tectonics: Divergent and convergent plate boundaries movement cause for earthquakes and volcanoes.

Fathom · 25-02-2018 07:56PM

Pangaea supercontinent Paleozoic and Mesozoic eras began to break apart about 175 million years ago. Continues today with earthquakes.

star gazer · 09-03-2018 11:17AM

Papua New Guinea A 6.7 following a 7.5 magnitude Earthquake from the 26th of February.

Fathom · 16-03-2018 10:10PM

The "living" crust of Earth. Geologically aways moving.

Manach · 19-03-2018 12:41PM

The vast majority of earthquakes are minor and unnoticed due to scale and depth. It is the "Black Swan" types that are the worry. In the 18th Century Lisbon went from capital of the Portugeuse empire to ruined city due to a combination of quake and Tsunami. Given historical precedents of quakes like the massive New Madrid quake of 1811, which had devastated the mostly unpopulated areas of America then when re-occurs this will effect millions and not the 100s of the 1800s.

Fathom · 21-03-2018 03:27PM

Last 24 hours Southern California earthquakes:

14 minutes ago 1.5 magnitude, 13 km depth Northridge, California, United States
about 6 hours ago 1.8 magnitude, 2 km depth Salton City, California, United States
about 11 hours ago 2.0 magnitude, 6 km depth Brawley, California, United States
about 17 hours ago 1.8 magnitude, 0 km depth Boron, California, United States

tabbey · 26-03-2018 11:13AM

Manach wrote: »

Given historical precedents of quakes like the massive New Madrid quake of 1811, which had devastated the mostly unpopulated areas of America then when re-occurs this will effect millions and not the 100s of the 1800s.

Where was New Madrid?

Black Swan · 26-03-2018 03:54PM

Injection of fracking wastewater has been associated with earthquakes in Oklahoma and South Dakota.

Source: https://www.forbes.com/sites/jamesconca/2016/09/07/the-connection-between-earthquakes-and-fracking/#116b09266d68

Fathom · 26-03-2018 07:17PM

Injecting Midwest earthquakes. What's next?

Black Swan · 28-03-2018 07:23PM

Magnitude 4.7 Fortuna, California.

Fathom · 29-03-2018 06:37PM

Earthquakes in California are the norm. Rare a day goes by without one.

Fathom · 01-04-2018 09:03PM

April 1, 2018 (Not April Fools!) California near San Jose Magnitude 2.6 earthquake 4 miles from Aromas, CA · 3:46 AM

Fathom · 06-04-2018 12:23AM

California Channel Islands. Magnitude 5.3. Felt a sway under my feet.

star gazer · 07-04-2018 01:26PM

Magnitude 6.5 Earthquake in Papua New Guinea following on from the damaging 7.5 a number of weeks ago.

Fathom · 09-04-2018 08:51PM

star gazer wrote: »

Magnitude 6.5 Earthquake in Papua New Guinea following on from the damaging 7.5 a number of weeks ago.

Aftershake?

Fathom · 14-04-2018 12:21AM

Magnitude 3.0 earthquake 4 miles from Rialto, CA

Fathom · 16-04-2018 02:55AM

99.7% chance a magnitude 6.7 quake or larger will strike California in the next 30 years.

Fathom · 19-04-2018 07:14PM

Magnitude 3.8 earthquake 4 miles from East Foothills, CA · Apr 16, 9:39 AM

Black Swan · 21-04-2018 12:59PM

Fathom wrote: »

99.7% chance a magnitude 6.7 quake or larger will strike California in the next 30 years.

California seems to be advertising preparations for the Big One more so on the telly recently.

Fathom · 21-04-2018 07:13PM

LA and SoCal: 234 earthquakes in the past 30 days

star gazer · 22-04-2018 09:35PM

Fathom wrote: »

Aftershake?

Does the six weeks later count as an aftershock? Same area, about 30km away.

USGS earthquake scenario in the San Fransisco Bay area (hypothetical M7).

Fathom · 23-04-2018 06:34PM

star gazer wrote: »

Does the six weeks later count as an aftershock? Same area, about 30km away. USGS earthquake scenario in the San Fransisco Bay area (hypothetical M7).

Maybe. Geologic time. Blink of eye.

Fathom · 27-04-2018 11:23PM

Today: 2.0 in Weldon, California.

Black Swan · 28-04-2018 10:10AM

235 earthquakes in last month CA. That's amazing.

Fathom · 30-04-2018 02:28AM

3.9 in Borrego Springs, California

Fathom · 30-04-2018 11:09PM

today: 3.3 in Alamo, California

Earthquakes

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