Author Topic: 7.5 in Alaska  (Read 4408 times)

0 Members and 1 Guest are viewing this topic.

Offline SlowModem

  • Weather at the speed of dialup!
  • Forecaster
  • *****
  • Posts: 6641
  • WX @ 26.4 kbs
    • Watts Bar Weather
7.5 in Alaska
« on: January 05, 2013, 11:48:26 AM »
There was a big one in Alaska this morning.  I hope everyone is OK.  Maybe we'll get a report from John later.

Story here
Greg Whitehead
Ten Mile, TN USA

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #1 on: January 10, 2013, 01:05:07 PM »
 Still shaking so far  around 20 AS.

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #2 on: January 11, 2013, 11:46:11 PM »
 In todays news it was mention that cable layer in up here to repair damage to submarine fiber optic cable. There are 2 breaks known  one north of Wrangell and one to the south of it. So there was some moment here inland from the quake epic center 60 miles offshore. Also mention there been 60 afterschocks. so USGS  does not show all of them and also AIES which is the state run version of USGS. Never trust de government they don't tell you everything.
Let you know more about the breaks if I find out more. Not sure if they are stress or sheared. Cable people didn't know either.


John

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #3 on: January 11, 2013, 11:58:21 PM »
A bit more from summary by USGS.

The January 5, 2013 M 7.5 earthquake off the west coast of southeastern Alaska occurred as a result of shallow strike-slip faulting on or near the plate boundary between the Pacific and North America plates.  At the location of this earthquake, the Pacific plate is moving north-northwestward with respect to the North America plate at a velocity of appoximately 51 mm/yr.

This earthquake is likely associated with relative motion across the Queen Charlotte fault system offshore of Alaska and British Columbia, Canada, which forms the major expression of the Pacific:North America plate boundary in this region. The surrounding area of the plate boundary has hosted 8 earthquakes of magnitude 6 or greater over the past 40 years. In 1949, a M 8.1 strike-slip earthquake nucleated in the Pacific:North America plate boundary region approximately 200 km to the southeast of the January 5 event, and the causative fault ruptured close to, or into, the January 5 source region. In October of 2012, a M 7.8 earthquake occurred in the plate-boundary region approximately 330 km to the south east of the January 5 earthquake, and was associated with oblique-thrust faulting. The January 5, 2013 earthquake is related to that Haida Gwaii earthquake three months previously, and is an expression of deformation along the same plate boundary system.

The January 5 event broke a fault approximately 50 km in length, and slipped 7-8 m. Aftershocks of the earthquake can be seen here.

Offline SlowModem

  • Weather at the speed of dialup!
  • Forecaster
  • *****
  • Posts: 6641
  • WX @ 26.4 kbs
    • Watts Bar Weather
Re: 7.5 in Alaska
« Reply #4 on: January 12, 2013, 12:57:23 AM »
In todays news it was mention that cable layer in up here to repair damage to submarine fiber optic cable. There are 2 breaks known  one north of Wrangell and one to the south of it. So there was some moment here inland from the quake epic center 60 miles offshore. Also mention there been 60 afterschocks. so USGS  does not show all of them and also AIES which is the state run version of USGS. Never trust de government they don't tell you everything.
Let you know more about the breaks if I find out more. Not sure if they are stress or sheared. Cable people didn't know either.


John


I'm surprised they still rely on cable.  I would have thought it would be mainly satellite and microwave by now.
 
Greg Whitehead
Ten Mile, TN USA

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #5 on: January 12, 2013, 05:53:40 PM »
They have several fiber optic cables running from several points up here to the Outside. Part of the problem is going thru Canada. We build the tower Canada services come first then our traffic. It like the roads. Alcan was built by US and  Canada maintains it. US just foots the bill for the maintenance. Also other problem is getting to the comm shell to work on equipment in the winter plus keeping the units fuelled up for electricity. Cables are generally maintenance free except for what happen. Satellite here can get sketchy at times . Signals are generally noisy, snapping and popping  may have to due with Geo magnetic issues at this latitude.

John

Offline SlowModem

  • Weather at the speed of dialup!
  • Forecaster
  • *****
  • Posts: 6641
  • WX @ 26.4 kbs
    • Watts Bar Weather
Re: 7.5 in Alaska
« Reply #6 on: January 12, 2013, 06:33:19 PM »
Satellite here can get sketchy at times . Signals are generally noisy, snapping and popping  may have to due with Geo magnetic issues at this latitude.

Silly me, I should have thought about that!  It's that aurora thing.  LOL  I guess that would mess up satellite and RF stuff.
Greg Whitehead
Ten Mile, TN USA

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #7 on: January 15, 2013, 02:59:42 AM »

Offline DanS

  • Chiang Mai weather
  • Forecaster
  • *****
  • Posts: 5434
    • ThaiWx
Re: 7.5 in Alaska
« Reply #8 on: January 15, 2013, 03:29:15 AM »
Man, talk about being persistent! Is that effecting the cable repair effort or has that been completed already?

Offline SlowModem

  • Weather at the speed of dialup!
  • Forecaster
  • *****
  • Posts: 6641
  • WX @ 26.4 kbs
    • Watts Bar Weather
Re: 7.5 in Alaska
« Reply #9 on: January 15, 2013, 03:38:04 AM »
Well, maybe that will relieve some of the pressure and prevent a gigantic one.
Greg Whitehead
Ten Mile, TN USA

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #10 on: January 15, 2013, 04:27:54 PM »
 Or put  more pressure on the next  spot  like up in the Yakata area. There seem to be plate movement there as lot small quakes in lower Yukon which sits on top of the diving plate.

John


 As to the cable repair have not heard anything.

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #11 on: January 31, 2013, 11:04:32 PM »
 There was an 6.0 after shock quake in the area as this 7.5 was this morning (1/31) at 0053. The quake rattle all thru the area. felt in Juneau 303 miles to the North. Been watching it closely and it had  quiet down into the mag 2 range so looks like stuff  out there 60 miles of shoreis still moving. In the late 1700  when spanish exploers where snooping around under the exploring/discovering pretensives they reported seeing red glows at nice out to sea as they sailed the outer coast of SEAK. Lot of bay and islands with spanish names. Vancouver also names thearea for english presents.


John

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #12 on: February 02, 2013, 01:57:05 AM »

Offline DanS

  • Chiang Mai weather
  • Forecaster
  • *****
  • Posts: 5434
    • ThaiWx
Re: 7.5 in Alaska
« Reply #13 on: February 02, 2013, 05:10:20 AM »
Man, that has to cause restless nights especially for the lower elevation Islanders. Wondering every night, when and if it will produce a Tsunami or not.

Offline Scalphunter

  • Forecaster
  • *****
  • Posts: 2314
Re: 7.5 in Alaska
« Reply #14 on: February 02, 2013, 09:09:29 PM »
Depending how far and the path it has to take and how close people here have an little time to move. But it'sfirst get up and go then see what is happening. Lot safer up above the 100 ft mark in the pucker brush then sitting  around waiting for some one to tell us to move to higher ground. Lot of the elders have passed that knowledge to the yonger generation if water receeds before it shold don't stop to fish but head up the montain. That is still practiced thru ot native villages here thru out SE AK. Craig  moved everyone out of town just after the 7.5 in minutes and they didn't wait for an waning. Was just grab and go.

John

Offline Garth Bock

  • Table Rock Lake Weather
  • Forecaster
  • *****
  • Posts: 2745
Re: 7.5 in Alaska
« Reply #15 on: February 02, 2013, 10:39:25 PM »
In todays news it was mention that cable layer in up here to repair damage to submarine fiber optic cable. There are 2 breaks known  one north of Wrangell and one to the south of it. So there was some moment here inland from the quake epic center 60 miles offshore. Also mention there been 60 afterschocks. so USGS  does not show all of them and also AIES which is the state run version of USGS. Never trust de government they don't tell you everything.
Let you know more about the breaks if I find out more. Not sure if they are stress or sheared. Cable people didn't know either.


John


I'm surprised they still rely on cable.  I would have thought it would be mainly satellite and microwave by now.
 

http://submarine-cable-map-2013.telegeography.com/