earthquake center

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earthquake center
earthquake center
On which days were there earthquakes in the Bay Area in the summer of 2007, and how big were they?


Also, how far away can an average earthquake be felt? For example, if there's a medium-strength earthquake centered in San Jose, what are the chances that someone 50 miles away in San Francisco would notice it?

Thanks!

You can probably find what you are looking for here.

http://earthquake.usgs.gov/regional/states/index.php?regionID=5

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Earthquake rocks southcentral Alaska CNN: 7.7 earthquake strikes Sumatra, Indonesia,

What is the probability of a Tsunami ORIGINATING in Hawaii due to an earthquake?


My mom is a resident of Hawaii, and was trapped on a low elevation island when the earthquake occured last sunday.

Considering Hawaii is not on a fault line, but rather the center of a moving teutonic plate and it is known that continental lift usually occurs at a fault line and a tsunami is the result of this dramatic upshift when it occurs underwater. Of course, any earthquake can cause massive landslides which can trigger large waves.

My assumption is that there is a much higer risk of a tsunami traveling to Hawaii.

By the way, Sunday's quake did create a tsunami. It was 3" high. Just because it's very small doesn't mean it isn't a tsunami!

If you wanted a mathematical probability, you would want to define your time horizon. Chances are very good that a massive tsunami will eventually orginate in Hawaii and wreak havoc in large parts of the globe. Chances are are also excellent that a tsunami originating in the Ring of Fire (the subduction zones that make up the Pacific Rim) will wreak havoc in Hawaii.

It's a question of when and how much. Both of these are almost certain to happen eventually. We know this from history, but lets look at the difference between historical time, and geologic time.

Several tsunamis originating in earthquakes near Alaska, Chile, and what became Washington State have been known to hit Hawaii within the last few centuries--a couple within the last hundred years. We know this because there's a historical record. People wrote about it. We know the names of the people who died in 1946 and 1960 in Hilo, for instance. There's a valley on the island where I live that has been virtually abandoned since the tsunami of 1946, but there are still people around who grew up there and remember it.

But not all history is written by human beings. Some of it is written on the landscape, and in the rocks. The geology of Hawaii tells us that there have been several huge landslides that have created devastating tsunamis in the short history of the islands (compared to, say, Scotland, where some of the rocks are 3 billion years old).

I live on half a volcano. The other half fell into the ocean 1.5 million years ago. We know it was a big splash because of how far the fragments traveled underwater. The geological record in Australia indicates tsunamis more than 130 feet high scoured the coast there 100,000 years ago and originated in Hawaii.

We also have a good idea where the next massive Hawaiian slide is likely to occur, and it's on the same island where our recent 6.7 quake happened. It's called the Hilina Slump, and it can be found in the neighborhood of the Kilauea volcano, which has been erupting continuously, changing the landscape and tectonic stresses dramatically, since 1983.

Looking at both kinds of historical records, we can reasonably predict that several traumatic tsunamis will hit Hawaii from earthquakes around the Pacific before a traumatic tsunami radiates out from Hawaii. But the one that comes from Hawaii may be much, much worse.


2 Comments

  1. Sam B
    Posted September 29, 2010 at 1:53 am | Permalink

    It does have to do with underground/above ground. The hypocenter is the actual point within the Earth where an earthquake starts. The epicenter is the just the surface expression of that starting point.

    That image is given is not very good, but the description is.

  2. pertik4
    Posted October 1, 2010 at 5:45 am | Permalink

    all pakistanis must respect their motherland that is india from where this pakistan originate