Microstrain, in parts per million
10
Dilatation (Mogi)
8
6
Dilatation (Pipe)
4
2
0
0
5
10
Assumptions:
Shear Modulus:
3000 MPa
Pressure Change:
100 MPa
Poisson Ratio: 0.25
Pipe: 6.5-11 km deep
250 m radius
Mogi Source:
9 km deep
595 m radius
15
Distance from source, in kilometers
VOLCANO DEFORMATION–
Geodetic Monitoring Techniques
By Daniel Dzurisin
U.S. Geological Survey graphics
20