microquake


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microquake

(geophysics)
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Nadeau and McEvilly discovered that many spots along the San Andreas produce characteristic microquakes months to years apart.
The microquakes, however, provide a direct look at the kinds of changes going on deep underground.
Also, the microquakes were sensed only beneath Long Beach.
They call their algorithm Fingerprint And Similarity Thresholding, or FAST, and it could transform how seismologists detect microquakes temblors that don't pack enough punch to register as earthquakes when analyzed by conventional methods.
Statistically there may be millions of microquakes in any given year throughout the world, of which some [10.
Seismologists already know that hydraulic fracturing -- which involves blasting water, sand and chemicals deep into underground rock formations to free oil and gas -- can cause microquakes that are rarely strong enough to register on monitoring equipment.
Southern Methodist University researchers have recorded more than 300 quakes around Azle since early December, with some days experiencing swarms of hundreds of microquakes and other days none.
Thousands of microquakes detected in the crust revealed a zigzag fault pattern roughly paralleling the course of the Mississippi River at the junction of Kentucky, Missouri, Tennessee, and Arkansas.
Nadeau used this method to predict time windows for microquakes in 13 spots around Parkfield.
At that same time, similar bursts of perceptible jolts and microquakes started at a dozen other sites in the western United States, including Mt.
who are trying to make sense of the far-flung microquakes.