New Quake of 6.5 magnitude Shakes Chile Capital

Just after the recent 8.3, this 6.5 that just hit Santiago is more than troubling.
Is this a prelude to another 8+?

SANTIAGO: A tremor struck Chile's capital city Santiago on Monday, shaking buildings, according to Reuters witnesses.

The U.S. Geological Survey said the tremor had a magnitude of 6.5, with an epicentre 143 kilometres (89 miles) north-west of port city Valparaiso.

The Onemi emergency service said it had not generated conditions necessary to create a tsunami.

The port city of Coquimbo in Chile was hit by an 8.3 magnitude earthquake and a tsunami on Wednesday, killing 13 people.

Since then there have been regular aftershocks.

(Reporting by Anthony Esposito and Rosalba O'Brien; Editing by Chris Reese and James Dalgleish)

- Reuters

www.channelnewsasia.com...

a reply to: IAMTAT

Dumb question....
Could this be a aftershock to the 8.3?

Or an entirely different thing?

a reply to: TNMockingbird

Aftershock, perhaps.

a reply to: IAMTAT

I'm thinking just another aftershock.

Those poor people though. We need to funnel all monies earmarked for humanitarian aid elsewhere, down there to Chile. They're peaceful people who don't hurt anyone, yet they seem to get the worst of The Ring Of Fire.

originally posted by: IAMTAT
Just after the recent 8.3, this 6.5 that just hit Santiago is more than troubling.
Is this a prelude to another 8+?

SANTIAGO: A tremor struck Chile's capital city Santiago on Monday, shaking buildings, according to Reuters witnesses.

The U.S. Geological Survey said the tremor had a magnitude of 6.5, with an epicentre 143 kilometres (89 miles) north-west of port city Valparaiso.

The Onemi emergency service said it had not generated conditions necessary to create a tsunami.

The port city of Coquimbo in Chile was hit by an 8.3 magnitude earthquake and a tsunami on Wednesday, killing 13 people.

Since then there have been regular aftershocks.

(Reporting by Anthony Esposito and Rosalba O'Brien; Editing by Chris Reese and James Dalgleish)

- Reuters

www.channelnewsasia.com...

I sure hope it isn't a precursor to a larger one than the 8.3 that happened. That would really be a shocker if it was.

a reply to: IAMTAT

Well, LOL!
That's what I meant....too much talking and typing...
Trying to pretend I'm interested in the subject matter in my "real world" and
paying too much attention to the subject matter in my "internet world"...

a reply to: Vasa Croe

It's definitely getting very active down there. I'm afraid there will be more big ones soon.

another biggie rolling thru on GEE... not as big as the 6.5, but not small either!

Hopefully, TA shows up soon to give us his "two cents". I believe in the previous thread he mentioned to not be surprised if some large aftershocks happened after the 8.3... I'm hoping things calm down in that region.. Must be terrifying living there when you have these large quakes constantly happening.

A lot of significant earthquakes there in the past 5 days.
Two today.

6.5
46km WSW of Illapel, Chile
2015-09-21 17:39:58 UTC24.7 km deep
6.3
52km W of Illapel, Chile
2015-09-21 05:39:33 UTC22.8 km deep
6.2
82km W of La Ligua, Chile
2015-09-19 12:52:19 UTC10.6 km deep
6.3
90km NW of Valparaiso, Chile
2015-09-18 09:10:44 UTC8.7 km deep
6.7
53km W of Illapel, Chile
2015-09-17 04:10:30 UTC30.1 km deep
6.5
54km S of Ovalle, Chile
2015-09-17 03:55:06 UTC35.0 km deep
6.4
64km NW of Illapel, Chile
2015-09-17 01:41:09 UTC35.0 km deep
7.0
25km W of Illapel, Chile
2015-09-16 23:18:42 UTC30.9 km deep
6.4
58km W of Illapel, Chile
2015-09-16 22:59:13 UTC22.0 km deep
8.3
46km W of Illapel, Chile
2015-09-16 22:54:33 UTC25.0 km deep

earthquake.usgs.gov...

Not just another quake!!

156 in the last 30 days!

It's not just another 8.3 quake. The grounds in Chile seem to have been shaking around the clock the last week.
All 4 or above. On the hour, 24/7 earthquake.
The 8.3 ...it's just a peak in a very long row of earthquake holiday...nightmare.

Check out the data:
www.volcanodiscovery.com...

a reply to: IAMTAT
Most probably it's just another aftershock. They're pretty typical after such an event as that mag 8.3, especially as it was fairly shallow and caused by subduction. Things haven't settled down yet.

Checking the USGS world quake map and setting it to show all mag 4.5-plus quakes in the world over the past 7 days, then zooming in on the Chile quake region, we get this:

As you can see, that map region displays 128 quakes mag 4.5 or bigger in the past 7 days, and that's out of 194 quakes in the same period for the whole world. (The mag 8.3 is the one in blue as I clicked on it to show the data.)

The latest mag 6.5 today is pretty close to the original main shock (roughly 70 km/40-odd miles at a guess), it's at about the same depth (24.7 km vs 25 km for the main shock) and well within the expected aftershock magnitude range. Aftershocks can be up about 1 mag less than the main shock, so even a mag 7.3 would not be too surprising. Biggest one so far was a 7.0, which came along cca half an hour after the main shock.

So far, there have been nine aftershocks of mag 6.0 or bigger and there could be more. It can take many days or even weeks for things to properly settle down after such a huge jolt.

a reply to: Daalder

All but 9 of those quakes on the list you've linked to have occurred since the mag 8.3. The reason there have been so many since then is because they are aftershocks, which is normal for such big, shallow, subduction zone seismic events. You can confirm this fact just by searching eg "subduction zone quake aftershock sequence".

By the way, that site you linked is not very reliable. Their data are not updated. They list the mag 8.3 as a mag 7.8 (same date, time and location, same quake), but if you click their own "info" link for it, their new page shows it as a mag 7.6, which is even more outdated data.

I recommend using sites that update their data after it's been manually reviewed by seismologists. Like eg USGS or EMSC.