Related Experiment Video
Updated: Jun 21, 2026

Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
Nonvolcanic tremor evolution and the San Simeon and Parkfield, California, earthquakes
Robert M Nadeau1, Aurélie Guilhem
1Berkeley Seismological Laboratory, University of California, Berkeley, CA 94720, USA.
Abstract:
Nonvolcanic tremors occur adjacent to locked faults and may be closely related to the generation of earthquakes. Monitoring of the San Andreas Fault in the Parkfield, California, region revealed that after two strong earthquakes, tremor activity increased in a nearly dormant tremor zone, increased and became periodic in a previously active zone, and has remained elevated and periodic for over 4 years. Static shear- and Coulomb-stress increases of 6 to 14 kilopascals from these two earthquakes are coincident with sudden increases in tremor rates. The persistent changes in tremor suggest that stress is now accumulating more rapidly beneath this part of the San Andreas Fault, which ruptured in the moment magnitude 7.8 Ft. Tejon earthquake of 1857.
Related Concept Videos
Variation in Acceleration due to Gravity near the Earth's Surface
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
Forced Oscillations
Vibrating Concrete
Damped Oscillations
Although friction and other non-conservative...
Simple Harmonic Motion
Radioactive Decay and Radiometric Dating