Low level seismic (swarm) activity at Mt Hood, Oregon

  • Thread starter Astronuc
  • Start date
  • #1
Astronuc
Staff Emeritus
Science Advisor
18,746
1,791

Main Question or Discussion Point

A journalist reported a 'New Earthquake Swarm is Rocking Oregon's Mt Hood.
http://www.wired.com/2016/05/new-earthquake-swarm-rocking-mt-hood

I wouldn't say rocking.

I checked USGS, and didn't find anything over Mag 2.5, so I refined the search in the range of Mag 1 to 2.5, and found a number of small earthquakes in the range of 1 to 1.9 scattered around the south side of Mt. Hood just north of State Rd 35, and just east and south east of the Timberline ski area. The depths are about 3 to 4 km.

Code:
2016-05-17 00:17:39 UTC  3.5 km  1.0  23km ESE of Mount Hood Village, Oregon
2016-05-16 21:59:51 UTC  3.1 km  1.2  23km ESE of Mount Hood Village, Oregon
2016-05-16 21:50:07 UTC  2.9 km  1.7  Other Event 22km E of Mount Hood Village
2016-05-16 21:47:52 UTC  3.7 km  1.4  22km ESE of Mount Hood Village, Oregon
2016-05-16 21:47:40 UTC  3.5 km  1.4  23km ESE of Mount Hood Village, Oregon
2016-05-16 21:35:33 UTC  3.8 km  1.1  23km ESE of Mount Hood Village, Oregon
2016-05-16 19:30:45 UTC  3.2 km  1.0  23km ESE of Mount Hood Village, Oregon
2016-05-16 16:48:35 UTC  3.6 km  1.3  22km ESE of Mount Hood Village, Oregon
2016-05-16 14:31:03 UTC  3.4 km  1.7  22km E of Mount Hood Village, Oregon
2016-05-16 13:53:50 UTC  3.8 km  1.4  22km ESE of Mount Hood Village, Oregon
2016-05-16 13:45:54 UTC  3.6 km  1.5  21km E of Mount Hood Village, Oregon
2016-05-16 13:39:20 UTC  3.3 km  1.9  22km E of Mount Hood Village, Oregon
2016-05-16 13:30:08 UTC  4.2 km  1.4  22km ESE of Mount Hood Village, Oregon
2016-05-16 13:26:56 UTC  3.8 km  1.1  23km ESE of Mount Hood Village, Oregon
2016-05-16 13:21:30 UTC  4.1 km  1.2  22km ESE of Mount Hood Village, Oregon
2016-05-16 13:17:22 UTC  2.6 km  1.4  21km ESE of Mount Hood Village, Oregon
2016-05-16 13:02:33 UTC  4.2 km  1.3  22km ESE of Mount Hood Village, Oregon
2016-05-16 12:53:31 UTC  3.9 km  1.7  23km ESE of Mount Hood Village, Oregon
2016-05-16 12:30:49 UTC  3.8 km  1.1  22km ESE of Mount Hood Village, Oregon
2016-05-16 12:19:43 UTC  3.6 km  1.8  22km ESE of Mount Hood Village, Oregon
2016-05-16 12:03:38 UTC  4.0 km  1.6  23km E of Mount Hood Village, Oregon
2016-05-16 12:03:33 UTC  3.7 km  1.5  22km ESE of Mount Hood Village, Oregon
2016-05-16 11:54:59 UTC  4.0 km  1.2  22km ESE of Mount Hood Village, Oregon
2016-05-16 11:43:48 UTC  3.1 km  1.6  22km E of Mount Hood Village, Oregon
2016-05-16 10:55:00 UTC  3.5 km  1.3  22km ESE of Mount Hood Village, Oregon
2016-05-16 10:39:08 UTC  3.8 km  1.5  23km ESE of Mount Hood Village, Oregon
2016-05-16 10:10:11 UTC  3.6 km  1.1  22km ESE of Mount Hood Village, Oregon
2016-05-16 09:02:55 UTC  3.2 km  1.5  21km ESE of Mount Hood Village, Oregon
2016-05-16 08:53:15 UTC  3.8 km  1.5  23km ESE of Mount Hood Village, Oregon
2016-05-16 08:28:25 UTC  3.6 km  1.2  22km ESE of Mount Hood Village, Oregon
2016-05-16 06:33:10 UTC  3.6 km  1.5  22km E of Mount Hood Village, Oregon
2016-05-16 06:19:36 UTC  3.2 km  1.6  22km ESE of Mount Hood Village, Oregon
2016-05-16 05:56:23 UTC  2.6 km  1.3  22km ESE of Mount Hood Village, Oregon
2016-05-16 05:25:53 UTC  3.5 km  1.1  23km ESE of Mount Hood Village, Oregon
2016-05-16 05:24:41 UTC  3.8 km  1.1  22km ESE of Mount Hood Village, Oregon
2016-05-16 05:07:56 UTC  3.8 km  1.5  22km ESE of Mount Hood Village, Oregon
2016-05-16 02:07:19 UTC  4.1 km  1.1  22km ESE of Mount Hood Village, Oregon
2016-05-16 01:38:33 UTC  3.3 km  1.5  22km E of Mount Hood Village, Oregon
2016-05-16 01:17:42 UTC  4.3 km  1.1  22km ESE of Mount Hood Village, Oregon

2016-05-13 12:09:43 UTC  4.4 km  1.1  20km E of Mount Hood Village, Oregon
I'm not sure what is the 'other event'.
 
Last edited:

Answers and Replies

  • #2
12,633
9,148
A journalist reported a 'New Earthquake Swarm is Rocking Oregon's Mt Hood.
http://www.wired.com/2016/05/new-earthquake-swarm-rocking-mt-hood

I wouldn't say rocking.

I checked USGS, and didn't find anything over Mag 2.5, so I refined the search in the range of Mag 1 to 2.5, and found a number of small earthquakes in the range of 1 to 1.9 scattered around the south side of Mt. Hood just north of State Rd 35, and just east and south east of the Timberline ski area.
Beside the low magnitude. How far is the Yellowstone bubble? This distance concerns me whenever I hear about an earthquake in the US.
 
  • #3
Astronuc
Staff Emeritus
Science Advisor
18,746
1,791
Beside the low magnitude. How far is the Yellowstone bubble? This distance concerns me whenever I hear about an earthquake in the US.
About 600 miles from Yellowstone, so it's not related. Mt Hood is one of numerous Cascade volcanoes. Hood's last eruption was about 200 years ago.
 
  • #4
davenn
Science Advisor
Gold Member
2019 Award
9,121
7,062
I'm not sure what is the 'other event'.
usually refers to something caused by human activity ... mining blast, mine collapse, fracking, etc etc

but noted tho that this "other Event" is in the same area as the other events
so maybe just not well defined ??
 
  • #5
OmCheeto
Gold Member
2,114
2,499
but noted tho that this "other Event" is in the same area as the other events
so maybe just not well defined ??
I downloaded the data after I saw this thread, and it appears they've thrown that reading out.

I was also surprised to see in the Wired article that this was tectonic activity, and not volcanic, so I double checked that.

Seismic Monitoring at Mount Hood, Oregon [USGS]
Mount Hood is one of the most seismically active volcanoes in the Washington and Oregon Cascades, and the most seismically active volcano in Oregon. In an average month 1-2 earthquakes are located by the Pacific Northwest Seismic Network (PNSN) within 3 miles of the summit. Most Hood earthquakes don't actually occur directly beneath the volcano's summit, but instead in one of several clusters located 2-5 km west, southwest, and southeast of the summit.
...
Scientists believe that earthquakes in the clusters south of the summit occur on tectonic faults and aren't directly related to volcanic processes occurring beneath Mount Hood.
Here's a neat little info-graphic of how often the Cascade volcanoes have erupted over the last 4000 years:

img1052_623w_500h.eruptions.of.cascade.mountains.last.4000.years.jpg

[ref]
 

Related Threads on Low level seismic (swarm) activity at Mt Hood, Oregon

Replies
1
Views
1K
Replies
13
Views
6K
  • Last Post
Replies
3
Views
5K
Replies
6
Views
2K
Replies
3
Views
5K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
5
Views
5K
Replies
7
Views
2K
  • Last Post
Replies
7
Views
6K
Replies
8
Views
1K
Top