A stable gravity downward continuation for structural delineation in Sulu Sea region.
Saved in:
| Title: | A stable gravity downward continuation for structural delineation in Sulu Sea region. |
|---|---|
| Authors: | Ali, Abdu Elazeem Osman Adam1, Liu, Zhan1, Bai, Yongliang1, Peng, Guomin1, Farwa, Abdalla Gumaa2, Ahmed, Abboud Suliman3 |
| Source: | Journal of Applied Geophysics. Aug2018, Vol. 155, p26-35. 10p. |
| Subjects: | Physiological effects of gravity, Standard deviations, Flow measurement, Dispersive interactions |
| Geographic Terms: | Sulu Sea |
| Abstract: | We have presented a discrete equivalent source method to perform a stable gravity downward continuation for structural delineation in the Sulu Sea region. Our method automatically selects an effective small amount of the discrete sources by using the modified Blakely and Simpson's method. It tests whether each observed gravity is minimum or maximum relative to the neighbouring eight points, then assigns the coordinates to one discrete source. This procedure reduces the coefficient matrix size. Moreover, the method assumes each source as a point source instead of rectangular prism to reduce model parameters. Then, it iteratively searches an optimum solution and the corresponding depth by simultaneously using both the CG and Golden Section Search algorithms. The optimum solution and the corresponding depth are then used to compute the downward continued gravity field. Testing on synthetic data confirmed the efficiency of our method in performing stable downward continuation. The method is also appropriate for computing gravity upward continuation, potential field on a plane or an uneven surface, and centroid depths of causative sources. A combination of both the downward continuation and an effective boundary detection technique delineated several faults and volcanic/intrusive rocks in the Sulu Sea region. These structure were formed by plate movement, subduction and collision. Finally, the reoriented structures along the dextral strike-slip fault that passes though the Sulu Sea and Sulu ridge was attributed to the increasing speed of the Philippine plate towards the north. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Applied Geophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
|---|---|
| Header | DbId: egs DbLabel: Engineering Source An: 130689670 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: A stable gravity downward continuation for structural delineation in Sulu Sea region. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ali%2C+Abdu+Elazeem+Osman+Adam%22">Ali, Abdu Elazeem Osman Adam</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+Zhan%22">Liu, Zhan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bai%2C+Yongliang%22">Bai, Yongliang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Peng%2C+Guomin%22">Peng, Guomin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Farwa%2C+Abdalla+Gumaa%22">Farwa, Abdalla Gumaa</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Ahmed%2C+Abboud+Suliman%22">Ahmed, Abboud Suliman</searchLink><relatesTo>3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Applied+Geophysics%22">Journal of Applied Geophysics</searchLink>. Aug2018, Vol. 155, p26-35. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Physiological+effects+of+gravity%22">Physiological effects of gravity</searchLink><br /><searchLink fieldCode="DE" term="%22Standard+deviations%22">Standard deviations</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+measurement%22">Flow measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Dispersive+interactions%22">Dispersive interactions</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Sulu+Sea%22">Sulu Sea</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We have presented a discrete equivalent source method to perform a stable gravity downward continuation for structural delineation in the Sulu Sea region. Our method automatically selects an effective small amount of the discrete sources by using the modified Blakely and Simpson's method. It tests whether each observed gravity is minimum or maximum relative to the neighbouring eight points, then assigns the coordinates to one discrete source. This procedure reduces the coefficient matrix size. Moreover, the method assumes each source as a point source instead of rectangular prism to reduce model parameters. Then, it iteratively searches an optimum solution and the corresponding depth by simultaneously using both the CG and Golden Section Search algorithms. The optimum solution and the corresponding depth are then used to compute the downward continued gravity field. Testing on synthetic data confirmed the efficiency of our method in performing stable downward continuation. The method is also appropriate for computing gravity upward continuation, potential field on a plane or an uneven surface, and centroid depths of causative sources. A combination of both the downward continuation and an effective boundary detection technique delineated several faults and volcanic/intrusive rocks in the Sulu Sea region. These structure were formed by plate movement, subduction and collision. Finally, the reoriented structures along the dextral strike-slip fault that passes though the Sulu Sea and Sulu ridge was attributed to the increasing speed of the Philippine plate towards the north. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Applied Geophysics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=130689670 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jappgeo.2018.05.009 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 26 Subjects: – SubjectFull: Physiological effects of gravity Type: general – SubjectFull: Standard deviations Type: general – SubjectFull: Flow measurement Type: general – SubjectFull: Dispersive interactions Type: general – SubjectFull: Sulu Sea Type: general Titles: – TitleFull: A stable gravity downward continuation for structural delineation in Sulu Sea region. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ali, Abdu Elazeem Osman Adam – PersonEntity: Name: NameFull: Liu, Zhan – PersonEntity: Name: NameFull: Bai, Yongliang – PersonEntity: Name: NameFull: Peng, Guomin – PersonEntity: Name: NameFull: Farwa, Abdalla Gumaa – PersonEntity: Name: NameFull: Ahmed, Abboud Suliman IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 09269851 Numbering: – Type: volume Value: 155 Titles: – TitleFull: Journal of Applied Geophysics Type: main |
| ResultId | 1 |
