Application of Moving Average (MA) and Upward Continuation Methods to Bouguer Gravity Anomaly Data for Fault Analysis of the Earthquake Risk Area of Timor and Flores Islands

Eko Minarto; Naila Yuni Azhari

doi:10.1088/1742-6596/1951/1/012051

Application of Moving Average (MA) and Upward Continuation Methods to Bouguer Gravity Anomaly Data for Fault Analysis of the Earthquake Risk Area of Timor and Flores Islands

Journal of Physics Conference Series ◽

10.1088/1742-6596/1951/1/012051 ◽

2021 ◽

Vol 1951 (1) ◽

pp. 012051

Author(s):

Eko Minarto ◽

Naila Yuni Azhari

Keyword(s):

Gravity Anomaly ◽

Moving Average ◽

Fault Analysis ◽

Continuation Methods ◽

Earthquake Risk ◽

Bouguer Gravity ◽

Risk Area ◽

Bouguer Gravity Anomaly ◽

Upward Continuation

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A model study for estimating optimum upward-continuation height for gravity separation with application to a Bouguer gravity anomaly over a mineral deposit, Jilin province, northeast China

Geophysics ◽

10.1190/1.2719497 ◽

2007 ◽

Vol 72 (4) ◽

pp. I45-I50 ◽

Cited By ~ 30

Author(s):

Hualin Zeng ◽

Deshu Xu ◽

Handong Tan

Keyword(s):

Gravity Anomaly ◽

Northeast China ◽

Mineral Deposit ◽

Gravity Separation ◽

Jilin Province ◽

Average Height ◽

Bouguer Gravity ◽

Bouguer Gravity Anomaly ◽

Upward Continuation ◽

Optimum Height

Upward continuation can be used to separate a regional gravity anomaly resulting from deep sources from the observed gravity. We present a practical method, based on model studies, to derive an optimum upward continuation height for regional-residual gravity separation. Using this method we can calculate an optimal height for upward continuation. Although mathematically there is no optimum height, this method provides an objective procedure to calculate a best height for upward continuation. We initially use a 2D model to calculate an optimum separation height, as given by the maximum crosscorrelation between the upward continuation of the observed gravity and a known regional anomaly. For an unknown regional field, we calculate a series of crosscorrelations between the upward continuations at two successive heights. The average height of the maximum deflection of these crosscorrelation values yields the optimum height for regional-residual separation. The method was applied to the Bouguer gravity anomaly over a mineral deposit in the Jilin province in northeast China. When we subtract the estimated regional anomaly obtained in this manner from the Bouguer anomaly, we can obtain a residual anomaly that clearly shows the location of two known iron bodies.

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