john's picture

M6.9 Earthquake Offshore Eureka, California, March 10, 2014

The earthquake occurred at 0700 PDT, 7 hours after the forecast for the figure below was computed (it is computed at midnight).  Using the hazard viewer, we can draw a circle of 100 km radius around the epicenter.  The forecast table (lower left corner) indicates that there was a 25% chance of an M>6 earthquake within the next year, and a 91.6% chance within the next 3 years. 

(Update on March 11:  The magnitude has been further refined to 6.8 rather than 6.9)


Steve's picture

French Omelet

The French Riviera enjoys a wonderful climate. No surprise that all those movie stars, sports heroes, and super models hang out in places like Monaco, Nice, Cannes and Fréjus.   OK --  maybe not so many rich and famous spend time in Fréjus, but it is the setting for today’s blog, so bear with me.

john's picture

South Carolina Earthquake M4.1: More Thoughts

There will be the inevitable speculation about whether the earthquake yesterday in South Carolina was related to fluid reinjection.  One way to think about this is to look at the drilling sites in the United States that may have reinjection wells associated with them.  I show such a map below that originates from here.  You can see that the number of wells on the border of South Carolina and Georgia (where the earthquake occurred) is rather low, by comparison with other parts of the country. 

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Magnitude 4.1 Earthquake in South Carolina, February 14, 2014

An unusual event in South Carolina just occurred, a magnitude 4.1 event.  At the present time, there is no reason to think this is anything but a relatively rare event.  However, it should also be recalled that Charleston, South Carolina was destroyed by a major earthquake on August 31, 1886.  Estimates place the magnitude in excess of 7, possibly as large as 7.3 moment magnitude.  So while unusual, earthquakes are not unknown in this area. 

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Lectures on Natural Disasters

Check out the course I am teaching this winter quarter at the University of California, Davis, California.  Weekly commentary is here.  The lectures can be found in power point form here.  The lectures are by and large taken from material in Wikipedia.

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California is in a Record Drought, Britain has Record Floods

A headline in USA Today proclaims that "Britain's Flood Crisis Deepens, Thames Bursts its Banks".  Meanwhile California is in the midst of a record drought, recent rains notwithstanding.  While not necessarily the result of global warming, the historic conditions in different parts of the globe remind us that disasters can come in many forms, not just earthquakes or typhoons.  The economic damages from t

Steve's picture

Alaska Earthquake and Tsunami: 50 years on

March 27, 2014 marks the 50-th anniversary of the Great Alaska Earthquake and Tsunami.  Although perhaps not an occasion for cake and ice cream, it certainly is an occasion for thought regarding both historical and future earthquake disasters. Who can say, 50 years from now we might be reminiscing about the Great Cascadia Earthquake and Tsunami of 2015.    

john's picture

Eruption at Mt. Sinabung, Indonesia

This term as I teach the course on risk and natural disasters, I am using the social site to store the lectures, as well as to report on disasters occurring during this period of time.  The eruption of Mt. Sinabung on Northern Sumatra is the most damaging event at the moment.

Steve's picture

Yangtze Tsunami

Have you ever heard of China’s Three Gorges Dam? That’s that mega project intended to control the Yangtze River.  At 1.3 miles long, 610 feet high, and possessing the hydroelectric capacity of eleven Hoover Dams, the thing is sometimes called “China’s Other Great Wall”.

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American Geophysical Union Meeting

Not much blogging this week.  I am at the annual AGU meeting in San Francisco.  I blogged about this some time ago.  It is the major meeting in our field.  My first was in the fall of 1974.  I got off the elevator at the mezzanine level of the old Jack Tar hotel and I saw a huge crowd -- maybe 300 scientists.  That was 39 years ago.  The meeting this week has over 25,000 attendees.  It fills pretty much the entire Moscone center in San Francisco.  Quite a change!  Many great talks on earthquakes, climate change, typhoons, and other disasters.


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