August 24, 79 C.E.: Vesuvius had something to say

August 24, 2014

Much as the GOP Caucus and other climate-change deniers, Roman officials in Pompeii and Herculaneum refused to be alarmed at the ground shaking, and obvious eruptions from Mount Vesuvius, on August 24, 79 C.E.

This morning we awake to news of earthquakes in Chile and California. The old Earth keeps rumbling.

Oddly, we now pay more attention to earthquakes than to other things that can cause greater, rolling disasters.

Santayana’s Ghost wonders if we ever learn from history.

Vesuvius, asleep for now. National Geographic photo by Robert Clark

Vesuvius, asleep for now. National Geographic photo by Robert Clark


Oklahoma earthquake swarm, November 2011?

November 6, 2011

Is it enough to call it a swarm?  Oklahoma hadn’t had a quake of great signficance in about 30 years, but they had a 5.6 and a 4.7  yesterday — and look at this list for today and yesterday from the USGS (list will probably change at USGS as time moves on):

MAG UTC DATE-TIME
y/m/d h:m:s
LAT
deg
LON
deg
DEPTH
km
LOCATION
MAP 3.3 2011/11/06 18:26:56 35.478 -96.864 5.0 4 km ( 2 mi) SE of Meeker, OK
MAP 3.7 2011/11/06 17:52:34 35.547 -96.819 5.0 7 km ( 4 mi) S of Sparks, OK
MAP 3.9 2011/11/06 15:07:05 35.535 -96.909 5.0 4 km ( 3 mi) NNW of Meeker, OK
MAP 3.2 2011/11/06 11:20:23 35.525 -96.883 5.0 3 km ( 2 mi) NNE of Meeker, OK
MAP 3.0 2011/11/06 11:16:20 35.523 -96.844 4.9 6 km ( 3 mi) ENE of Meeker, OK
MAP 3.4 2011/11/06 11:03:52 35.539 -96.825 5.0 8 km ( 5 mi) S of Sparks, OK
MAP 3.9 2011/11/06 10:52:35 35.567 -96.797 5.0 5 km ( 3 mi) SSE of Sparks, OK
MAP 4.0 2011/11/06 09:39:57 35.506 -96.865 5.0 3 km ( 2 mi) ENE of Meeker, OK
MAP 3.4 2011/11/06 09:22:04 35.585 -96.823 5.0 3 km ( 2 mi) S of Sparks, OK
MAP 2.7 2011/11/06 08:14:12 35.474 -96.794 5.0 7 km ( 4 mi) NNE of Johnson, OK
MAP 3.2 2011/11/06 07:32:40 35.544 -96.901 4.9 5 km ( 3 mi) N of Meeker, OK
MAP 3.8 2011/11/06 06:31:10 35.559 -96.874 5.0 7 km ( 4 mi) NNE of Meeker, OK
MAP 3.0 2011/11/06 04:54:00 35.540 -96.687 5.0 6 km ( 4 mi) N of Prague, OK
MAP 3.6 2011/11/06 04:03:41 35.554 -96.760 5.0 8 km ( 5 mi) SE of Sparks, OK
MAP 5.6 2011/11/06 03:53:10 35.537 -96.747 5.0 8 km ( 5 mi) NW of Prague, OK
MAP 3.6 2011/11/05 14:36:30 35.584 -96.789 4.9 4 km ( 2 mi) SE of Sparks, OK
MAP 3.4 2011/11/05 13:42:26 35.530 -96.766 5.0 9 km ( 5 mi) NW of Prague, OK
MAP 3.3 2011/11/05 11:24:15 35.521 -96.778 5.0 9 km ( 6 mi) WNW of Prague, OK
MAP 3.3 2011/11/05 09:12:11 35.591 -96.788 4.9 4 km ( 2 mi) SE of Sparks, OK
MAP 2.7 2011/11/05 07:50:42 35.559 -96.762 4.8 8 km ( 5 mi) SE of Sparks, OK
MAP 2.7 2011/11/05 07:44:34 35.488 -96.755 5.0 6 km ( 4 mi) W of Prague, OK
MAP 3.4 2011/11/05 07:27:20 35.566 -96.698 5.0 9 km ( 6 mi) N of Prague, OK
MAP 4.7 2011/11/05 07:12:45 35.553 -96.748 4.0 9 km ( 6 mi) SE of Sparks, OK

Back to Map Centered at 36°N, 96°W (That’s Tulsa, roughly)

 

23 quakes in two days.  Oklahomans might be excused for wondering what’s up.

Just technical details here.  USGS issued a notice on both of the larger quakes, the 4.7 on Saturday, November 5, and the 5.6 on Sunday, November 6.

Still, this isn’t much of a swarm for an active quake zone, like California, or Yellowstone, or Alaska.

But, for Oklahoma, this is big.  Plus, it appears to lay observers that earthquake intensity and frequency both have been building for over a year.   Recent earthquakes in Arkansas and Texas concern some local residents who fear the quakes are the result of hydrofracturing (fracking) activities being conducted in relation to natural gas and oil drilling and extraction.

And as this map of U.S. quakes in the preceding week shows, the quakes in Oklahoma are the largest in the U.S. for the week.

USGS animation of quakes in US for week ending Nov 6, 2011, afternoon

More quakes in California, on the USGS maps -- but the Oklahoma quakes are biggest

Research continues, and local residents stay nervous.

Here’s a map that should update with new quake information — which means, Oklahomans hope, that the indicators of quakes will go away over the next few days.

USGS map of Oklahoma City/Tulsa area where earthquakes occurred in the week leading up to November 6, 2011

USGS map of Oklahoma City/Tulsa area where earthquakes occurred in the week leading up to November 6, 2011

 


Laden’s late; but, is Yellowstone gonna blow AND TAKE US WITH IT?

February 26, 2011

The veteran reader of this blog — can there be more than one? — may recall the kerfuffle a couple of years ago when there was a “swarm” of earthquakes in the Yellowstone.  Alas for those prone to panic attacks, the swarm ran through the Hanukkah/Ramadan/Christmas/KWANZAA/New Year’s holidays, when other news is slack.

Yellowstone Caldera, Smith and Siegel 2000

What the Yellowstone Caldera might look like from space, by moonlight, on a clear night, if you can imagine the borders of Yellowstone National Park very vividly - Smith and Siegel, 2000

You might understand, then, why I say Greg Laden turns his considerable story-telling prowess to the issue late.  Still, his prowess towers over the rest of us, and he tells a great story.

Is the Yellowstone safe? he asks, rhetorically.

The answer is complex:

1) Wear a seat belt when driving around in the region;

2) Don’t feed the bears and make sure you understand bear safety; and

3) Somebody is going to get blasted by some kind of volcano in the area some day, but even if you live there the chances are it won’t be you.

The joy is in the journey — go read Laden’s explanation of the rising lava.  Heck, even those of us who think we know that stuff understand it better when he explains it.

Earlier in the Bathtub:

Also see:


Okalahoma earthquakes: No swarm

March 6, 2010

Three earthquakes in a week do not make a swarm.  Interesting that the last post on an earthquake in Oklahoma drew earthquake conspiratorialists and “skeptics.”  Too many people distrust all science and sources of information these days.

Here’s the dirt on Oklahoma’s shaking in the last week, from the U.S. Geological Service site:

Earthquake List for Map Centered at 36°N, 97°W

Update time = Sat Mar 6 18:00:02 UTC 2010

Here are the earthquakes in the Map Centered at 36°N, 97°W area, most recent at the top.
(Some early events may be obscured by later ones.)
Click on the underlined portion of an earthquake record in the list below for more information.

MAG UTC DATE-TIME
y/m/d h:m:s
LAT
deg
LON
deg
DEPTH
km
LOCATION
MAP 3.1 2010/03/05 20:35:13 35.608 -96.783 5.0 3 km ( 2 mi) E of Sparks, OK
MAP 2.5 2010/03/03 04:35:17 35.549 -97.282 5.0 2 km ( 1 mi) SSE of Jones, OK
MAP 4.1 2010/02/27 22:22:27 35.557 -96.747 3.3 9 km ( 5 mi) SE of Sparks, OK

This isn’t unusual at all, of course. I think many people just don’t understand that earthquakes happen all the time, but they usually get crowded out of the newspaper because no one really cares.

For contrast, take a look at this animated map of a strip a little wider than Utah, covering from north of the Yellowstone Caldera to Arizona.  Run the animation.  Generally on any day there will have been at least two dozen earthquakes in the previous week, several magnitude 3, occasionally a magnitude 4 thrown in.

Almost none of those quakes make any news.

Maybe it’s the Earth, laughing.  We can hope.

Laugh, and the world laughs with you;
Weep, and you weep alone.
For the sad old earth must borrow it’s mirth,
But has trouble enough of its own.
Sing, and the hills will answer;
Sigh, it is lost on the air.
The echoes bound to a joyful sound,
But shrink from voicing care.

(Excerpted from “Solitude,” 1917, by Ella Wheeler Wilcox (1850-1919))


Shakiest states — geologically, that is

March 4, 2010

USGS map of states with the most quakes

Quake rankings of states

Which states shake the most?  Here are the top 20.

Surprised that Maine makes the list?

Much more from the US Geological Survey here, “Top Earthquake States.”


Tsunami warnings for Hawaii: How science really works

February 27, 2010

As I write this it’s more than five hours away.

Earthquake map from USGS, showing location of the Chile quake 2-27-2010

Earthquake map from USGS, showing location of the Chile quake 2-27-2010 - click on map to go to interactive version at USGS site

A horrible, devastating earthquake hit Chile last night, on the west coast of South America.  Scientists at the Pacific Tsunami Warning Center fear it may have triggered a tsunami that will hit Hawaii today (an AP story says at 5:19 p.m. Eastern; that’s 4:19 p.m. Central, and just after 11:00 a.m. in Honolulu, Hawaii, Hawaiian-Aleutian Standard Time (HAST).

HONOLULU (Reuters) – Hawaii prepared to start evacuations ahead of a tsunami generated by a massive earthquake in Chile, a civil defense official on the U.S. island said on Saturday.

It planned to sound civil defense sirens across the island state at 6 a.m. local time (11 a.m. EST) after the Pacific Tsunami Warning Center said a tsunami was generated that could cause damage along the coasts of all the Hawaiian islands,

“Get off the shore line. We are closing all the beaches and telling people to drive out of the area,” said John Cummings, Oahu Civil Defense spokesman.

Buses will patrol beaches and take people to parks in a voluntary process expected to last five hours.

More than an hour before sirens were due to sound lines of cars snaked for blocks from gas stations in Honolulu.

“Urgent action should be taken to protect lives and property,” the Warning Center said in a bulletin. “All shores are at risk no matter which direction they face.”

*  *  *  *  *  *  *  *

The warning follows a huge earthquake in Chile that killed at least 82 people and triggered tsunamis up and down the coast of the earthquake-prone country.

The center estimates the first tsunami, which is a series of several waves in succession, will hit Hawaii at 11:19 a.m. Hawaii time (4:19 p.m. EST) in the town of Hilo on the Big Island of Hawaii, with waves in Honolulu at 11:52 a.m.

Sardina said the Hawaiian islands could expect waves of six feet (two meters) in some places. Other estimates have been higher but he could not confirm those were likely.

Plate tectonics at work — the Pacific plate pushing underneath South America.  The epicenter was 22 miles deep.  We get a glimpse into how geologists and others work with a report from the Times of London:

Several big aftershocks later hit the south-central region, including ones measuring 6.9, 6.2 and 5.6.

The earthquake was caused by the floor of the Pacific being pushed below South American land mass.

This sudden jerking of the sea-floor displaced water and triggered a tsunami, which is now crossing the ocean at a speed of a jet plane.

The Pacific Tsunami Warning Center issued a warning for Chile and Peru, and a less-urgent tsunami watch for Ecuador, Colombia, Panama, Costa Rica and Antarctica.

A spokesman said: “Sea level readings indicate a tsunami was generated.

Will a potential disaster in human lives be averted?

Isn’t this exactly how science is supposed to work?  Will the anti-science yahoos ignore the warnings?

Woo notice: Our dogs were restless last night.  I had to get up twice to let them out just to bark with the rest of the dogs in the neighborhood, who all seemed to be going nuts at once.  Looking at the news stories, it was just a bit before the big quake hit Chile.  It doesn’t make sense to me that dogs so far away from the epicenter would be affected that way.

Resources:

Hawaii map and threat map from the Pacific Tsunami Warning Center - 2-27-2010

Hawaii map and threat map from the Pacific Tsunami Warning Center, February 27, 2010. Click on image for current information.


Yellowstone Earthquake Swarm of 2010 fizzling out?

January 27, 2010

Inside Yellowstone noted just three earthquakes in the Yellowstone swarm in a 24-hour period covering most of Saturday.

It wasn’t the End of the World as Old Faithful Knows It, after all.

The Yellowstone Volcano Observatory (YVO) suggests the swarm continues, however – but doesn’t suggest anyone should be too concerned about it.

As of January 26, 2010 9:00 AM MST there have been 1,360 located earthquakes in the recent Yellowstone National Park swarm. The swarm began January 17, 2010 around 1:00 PM MST about 10 miles (16 km) northwest of the Old Faithful area on the northwestern edge of Yellowstone Caldera. Swarms have occurred in this area several times over the past two decades.

There have been 11 events with a magnitude larger than 3, 101 events of magnitude 2 to 3, and 1248 events with a magnitude less than 2. The largest events so far have been a pair of earthquakes of magnitude 3.7 and 3.8 that occurred after 11 PM MST on January 20, 2010.

The first event of magnitude 3.7 occurred at 11:01 PM MST and was shortly followed by a magnitude 3.8 event at 11:16 PM. Both shocks were located around 9 miles to the southeast of West Yellowstone, MT and about 10 miles to the northwest of Old Faithful, WY. Both events were felt throughout the park and in surrounding communities in Wyoming, Montana, and Idaho.

See the University of Utah Seismograph Stations for the most recent earthquake data and press releases. The team is working 24/7 to analyze and communicate information about the swarm. Seismograph recordings from stations of the Yellowstone seismograph network can be viewed online at: http://quake.utah.edu/helicorder/yell_webi.htm.

You can get the information from the horse’s mouth (Dragon’s Mouth?) — some enterprising earth sciences, geography or general science teacher can probably work up a great assignment for students to deal with the data and make sense from them.

Ground deformations in the Yellowstone Caldera, from satellite photos - Geology.com imageGround deformations in the Yellowstone Caldera, from satellite photos - Geology.com image

Ground deformations in the Yellowstone Caldera, from satellite photos, in 2005 - Geology.com image (This isn't really directly related to the earthquake swarm, but it's a cool image.)

Update, March 12, 2011: This post has been mighty popular over the last week.  Can someone tell me, in comments, whether this post was linked to by another site?  Why the popularity all of a sudden — even before the Japan earthquake and tsunami?  Please do!


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