Measurements were made with a gravimeter at different heights and coupled with an extensive survey of gravity around the base of the tower.
The Toyama City has carried out seismic surveys and dense gravity surveys crossing this fault (Toyama City 2013).
Areas thought to contain hydrocarbons are initially subjected to a gravity survey, magnetic survey and regional seismic reflection surveys to detect large scale features of the sub-surface geology.
There are now three major types of exploration methods: (1) surface methods such as geologic feature mapping and detection of seepages, (2) area surveys of gravity and magnetic fields, and (3) seismographic methods.
Remote sensing includes geophysical surveys of gravity, magnetics and electromagnetics (Brunner et al. 2006).
Geophysical surveys of gravity anomalies and/or seismic velocities are also powerful tools for examining subsurface active structures, especially in areas where surface features related to active structures are no longer visible.
An attempt has been made to understand the subsurface picture using geoscientific data, for example, Gravity survey, Landsat imagery, magnetotelluric (MT) survey and water chemistry.
Using extensive geophysical datasets from refraction/reflection experiments, gravity surveys, microtremor surveys, etc., Koketsu et al. (2008) proposed the Japan integrated velocity structure model (JIVSM) as a regional three-dimensional velocity structure model of Japan, including the complex Kanto Basin structure.
In this study, we have conducted a gravity survey and constructed a detailed Bouguer anomaly map of the EBFZNP, along with a compilation of previously published gravity data.
We performed two-dimensional (2D) density structure analysis by applying the 2D Talwani et al. method along the four gravity survey lines in this study (Lines A to D in Figs. 1 and 3).
