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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Geomagnetic Disturbances During the Maule (2010) Tsunami Detected by Four Spatiotemporal Methods

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Author(s):
Klausner, V. [1] ; Gimenes, H. M. [1] ; Cezarini, M. V. [1] ; Ojeda-Gonzalez, A. [1] ; Prestes, A. [1] ; Candido, C. M. N. [1] ; Kherani, E. A. [1] ; Almeida, T. [1]
Total Authors: 8
Affiliation:
[1] Vale Paraiba Univ, Phys & Astron, IP&D, Ave Shishima Hifumi 2911, BR-12244000 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: PURE AND APPLIED GEOPHYSICS; v. 178, n. 12, SI AUG 2021.
Web of Science Citations: 1
Abstract

Separating tsunamigenic variations in geomagnetic field measurements in the presence of more dominant magnetic variations by magnetospheric and ionospheric currents is a challenging task. The purpose of this article is to survey the tsunamigenic variations in the vertical component (Z) and the horizontal component (H) of the geomagnetic field using four spatiotemporal methods. Spatiotemporal analysis has shown enormous potential and efficiency in retrieving tsunamigenic contributions from geomagnetic field measurements. We select the Maule (2010) tsunami event on the west coast of Chile and examine the geomagnetic measurements from 13 ground magnetometers scattered in the Pacific Ocean covering a wide area from Chile, crossing the Pacific Ocean to Japan. The tsunamigenic magnetic disturbances are possibly due to two types of contributions, one arising from direct ocean motion and the other from atmospheric motion, both associated with tsunami forcing. Moreover, even though the tsunami waves decrease considerably with increasing epicentral distance, the tsunamigenic contributions are retrieved from a magnetic observatory in Australia (similar to 13,000 km radial distance from the epicenter). These results suggest that various types of tsunamigenic disturbances can be identified well from the integrated analysis framework presented in this work. (AU)

FAPESP's process: 15/50541-3 - Quantitative modeling of ocean/ionosphere coupling for monitoring tsunamis from space
Grantee:Esfhan Alam Kherani
Support Opportunities: Regular Research Grants
FAPESP's process: 11/21903-3 - Traveling ionospheric disturbances: simulation and observation, the importance of latitudinal coupling of gravity wave-Perkins-Es layer instabilities and forcing from pre-seismic events
Grantee:Esfhan Alam Kherani
Support Opportunities: Research Grants - Young Investigators Grants