microquake


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microquake

(geophysics)
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At the time of the temblor, another microquake has occurred near Bulgaria's town of Pernik with a magnitude of 2.
The microquake technique could have uses elsewhere.
Nadeau and McEvilly discovered that many spots along the San Andreas produce characteristic microquakes months to years apart.
A new algorithm designed to find matching seismic signals in large earthquake databases could find previously missed microquakes.
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.
Most of the roughly 80 induced microquakes began at least a few meters away from the injection site, where the pumped-in water hadn't reached.
Seismologists know hydraulic fracturing can cause microquakes, yet they and the oil and gas companies have taken pains to point out that a clear correlation has not been established.
Moore spotted the talc along a segment of the San Andreas Fault known to produce microquakes rather than huge tremors.
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.
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.