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aseism, aseismic
1. Resistant to the destructive effects of earthquakes.
2. No earthquake; without shaking (as exists with an earthquake).

Data on hydroseisms in wells are published annually by the U.S. Coast and Geodetic Survey.

Fault slips include aseismic creep and transient slip

Slip on faults occurs as a combination of relatively continuous aseismic creep and transient slip events. These transient events occur as earthquakes radiating seismic waves, and also as aseismic events with characteristic time scales of days to years.

A better understanding of the physical factors that control the relative amount and location of seismic and aseismic slip is a key goal in the study of fault mechanics and, in particular, can affect assessments of reginal seismic and tsunami hazards.

—From "Frictional Afterslip Following the 2005 Nias-Simeulue Earthquake, Sumatra";
Science, June 30, 2006; page 1921.