Gravity and Magnetic Survey PDF Print E-mail

In general, Gravity & Magnetic Branch belongs to Geophysics discipline of the Geological Survey of Bangladesh. It is one of the most vital branch and played many important role in the significant contributions of the organization. It contributed vital role in the discovery of three coal basin. Besides, it delineated subsurface geology of major part of northwest Bangladesh and demarcated some significant anomalous areas prospective for solid economic minerals including hard rock, metallic minerals etc. The branch produces and published a number of gravity and magnetic related maps, illustrations and reports. It paid major effort in preparing the following publications:

 

Responsibilities

 

Geophysics is an important subject of geosciences for subsurface geological investigation. Gravity and magnetic surveys are two significant tools of geophysics. Main objectives of the branch are to carryout gravity and magnetic surveys, analysis of collected data and on the basis of the results of analysis determination of subsurface structures and demarcation of mineral prospective areas are done. Findings lead to discover economic minerals by locating drill hole sites. Based on the results of analysis of collected data reports are prepared and published. Besides these, this branch provides assistance on gravity and magnetic survey related matters to other organizations of the country.

 

Achievements

 

Gravity and magnetic branch provided significant contributions to the great successes of the Geological Survey of Bangladesh. In the discovery of three coal field (Barapukuria, Khalaspir and Dighipara) this branch contributed successfully. Moreover, it located some areas prospective for metallic minerals. Preliminary drilling indicated their presence. Most of the drill hole sites of the organization were located by this branch. Besides, Bouguer Gravity Anomaly Map of Bangladesh and Aeromagnetic Anomaly Map of Bangladesh have been published under the supervision of this branch. 

 

Illustrations

 

1)       Different derivative maps of gravity anomaly of NW Bangladesh, e.g. 1st vertical derivatives, 2nd vertical derivative, high pass and low pass frequency filtered Bouguer anomaly, second order polynomial residual etc.

2)        Different derivative maps of Aeromagnetic anomaly of NW Bangladesh, e.g. 1st vertical derivatives, 2nd vertical derivative, high pass and low pass frequency filtered, reduced to pole Magnetic anomaly etc.

3)       2D, 2.5D, 2.75D & 3D Models of significant gravity anomalies of NW Bangladesh.

4)       2D, 2.5D, 2.75D & 3D Models of significant total field aeromagnetic & vertical field ground magnetic anomalies of NW Bangladesh.

(NB. Above Illustrations are included in different published and unpublished reports and articles)