The epicenter represents the projection of a hypocenter on the
surface of the Earth. The hypocenter is the true location of the
earthquake inside the Earth. Distances calculated from the observations
to the hypocenter and epicenter differ when the vertical
distance between them is considered. In this study, the depths of
the monitoring wells are much smaller than those of the hypocenters,
and thus they are ignored when the hypocenter is considered
in the three-dimensional model. Although the variation of the
depths of the monitoring wells will affect the estimation results
when the epicenter is considered, the depth influence should be
very small, and is thus also ignored in the two-dimensional model.
In this section, the relations between the maximum detectable
epicentral and hypocentral distances versus the earthquake magnitude
are examined first. Two models (Models I and II) are then proposed,
based on semi- and fully-empirical methods, respectively,
to develop the relationship between groundwater level change,
earthquake magnitude, and the epicentral distance. These two
models are used to estimate the maximum extent of stress influence.
The models are then applied to estimate the area of anomalous
stress for an earthquake event to show the potential of the
proposed method.
The epicenter represents the projection of a hypocenter on thesurface of the Earth. The hypocenter is the true location of theearthquake inside the Earth. Distances calculated from the observationsto the hypocenter and epicenter differ when the verticaldistance between them is considered. In this study, the depths ofthe monitoring wells are much smaller than those of the hypocenters,and thus they are ignored when the hypocenter is consideredin the three-dimensional model. Although the variation of thedepths of the monitoring wells will affect the estimation resultswhen the epicenter is considered, the depth influence should bevery small, and is thus also ignored in the two-dimensional model.In this section, the relations between the maximum detectableepicentral and hypocentral distances versus the earthquake magnitudeare examined first. Two models (Models I and II) are then proposed,based on semi- and fully-empirical methods, respectively,to develop the relationship between groundwater level change,earthquake magnitude, and the epicentral distance. These twomodels are used to estimate the maximum extent of stress influence.The models are then applied to estimate the area of anomalousstress for an earthquake event to show the potential of theproposed method.
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