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Earth, Planets and Space
Figure 2 | Earth, Planets and Space

Figure 2

From: Monthly GRACE detection of coseismic gravity change associated with 2011 Tohoku-Oki earthquake using northern gradient approach

Figure 2

Model-predicted and synthetic-data-retrieved seismic gravity changes due to 2011 Tohoku-Oki earthquake. (a) Model prediction of coseismic gravity changes, with 300 km Gaussian smoothing only. (b) Trend term obtained by fitting gridded time series of model-predicted postseismic gravity changes of 24 months in 2 years after the earthquake, with 300 km Gaussian smoothing. (c) Model prediction of the coseismic gravity changes same as (a) but with P3M6 destriping and 300 km Gaussian smoothing. (d) Model prediction of coseismic gravity changes with Duan09 destriping and 300 km Gaussian smoothing. (e) Gravity changes between the mean of 2 years before and after the earthquake, computed from the synthetic monthly GRACE observations (with seasonal and trend terms removed by time series fitting), with a filter of P3M6 destriping and 300 km Gaussian smoothing. (f) Gravity changes same as (e) but with a different filter, Duan09 destriping, and 300 km Gaussian smoothing. Note that 1 μGal equals 1 × 10−8 m s−2 in gravity change.

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