Journal
TECTONICS
Volume 39, Issue 9, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020TC006070
Keywords
intraplate seismicity; atmospheric precipitation; mantle anomaly; Norway
Categories
Funding
- NEONOR2 project
Ask authors/readers for more resources
Two enigmatic regions of high intraplate seismicity in Norway (Western Norway and the Nordland area) show a temporal correlation between the number of earthquakes within the upper crystalline crust and intensity of rain and snowmelt at the Earth's surface. This correlation is obvious in the Nordland area where detailed and reliable data on seismicity are available, whereas the correlation is weaker in Western Norway where detailed data on seismicity are missing. Moreover, these discrete zones of high seismic activity coincide spatially with prominent, low-velocity, and, most likely, thermally anomalous zones in the upper mantle. We propose that in addition to other causes, the high seismicity may be controlled by the anomalous upper mantle, along with topographically induced gravitational potential energy and crustal density variations. Precipitation-induced, seasonal increases in pore-fluid pressure within the fractured crystalline bedrock and changes in water loads may modulate the tectonically controlled seismicity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available