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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/24783
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dc.contributor.authorWang, Y-
dc.contributor.authorHeidarzadeh, M-
dc.contributor.authorSatake, K-
dc.contributor.authorHu, G-
dc.date.accessioned2022-07-04T11:49:57Z-
dc.date.available2022-07-04T11:49:57Z-
dc.date.issued2022-04-01-
dc.identifier.citationWang. Y., Heidarzadeh. M., Satake. K. and Hu. G. (2022) 'Characteristics of two tsunamis generated by successive Mwg 7.4 and Mwg 8.1 earthquakes in the Kermadec Islands on 4 March 2021', Natural Hazards and Earth System Sciences, 22 (3), pp. 1 - 10. doi: 10.5194/nhess-22-1073-2022.en_US
dc.identifier.issn1561-8633-
dc.identifier.urihttps://bura.brunel.ac.uk/handle/2438/24783-
dc.descriptionData availability: The datasets were derived from sources in the public domain. The tide gauge data used in this research were provided by the Sea Level Station Monitoring Facility of the Intergovernmental Oceanographic Commission (http://www.ioc-sealevelmonitoring.org/list.php; IOC, 2022). We used bathymetric and topographic data of the General Bathymetric Chart of the Ocean (https://www.gebco.net/data_and_products/gridded_bathymetry_data/; GEBCO, 2022). We used the earthquake focal mechanism catalog of the Global Centroid Moment Tensor Project (https://www.globalcmt.org/CMTsearch.html; Global CMT, 2022) and the earthquake source model of the United States Geological Survey (https://earthquake.usgs.gov/earthquakes/eventpage/us7000dflf/executive; USGS, 2022). We used the GMT software for drafting some of the figures (Wessel and Smith, 1998).en_US
dc.description.abstractCopyright © The Author(s) 2022. On 4 March 2021, two tsunamigenic earthquakes (Mw 7.4 and Mw 8.1) occurred successively within 2 h in the Kermadec Islands, offshore New Zealand. We examined sea level records at tide gauges located at ∼100 to ∼2000 km from the epicenters, conducted Fourier and wavelet analyses as well as numerical modeling of both tsunamis. Fourier analyses indicated that the energy of the first tsunami is mainly distributed over the period range of 5–17 min, whereas it is 8–32 min for the second tsunami. Wavelet plots showed that the oscillations of the first tsunami continued even after the arrival of the second tsunami. As the epicenters of two earthquakes are close to each other (∼55 km), we reconstructed the source spectrum of the second tsunami by using the first tsunami as the empirical Green's function. The main spectral peaks are 25.6, 16.0, and 9.8 min. The results are similar to those calculated using tsunami-to-background ratio method and are also consistent with the source models.en_US
dc.description.sponsorshipJapan Society for the Promotion of Science (grant no. 19J20293); Royal Society (grant no. CHL\R1\180173).en_US
dc.format.extent1 - 10-
dc.format.mediumPrint-Electronic-
dc.languageEnglish-
dc.language.isoen_USen_US
dc.rightsCopyright © The Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.-
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/-
dc.titleCharacteristics of two tsunamis generated by successive Mwg 7.4 and Mwg 8.1 earthquakes in the Kermadec Islands on 4 March 2021en_US
dc.typeArticleen_US
dc.identifier.doihttps://doi.org/10.5194/nhess-22-1073-2022-
dc.relation.isPartOfNatural Hazards and Earth System Sciences-
pubs.issue3-
pubs.publication-statusPublished-
pubs.volume22-
dc.identifier.eissn1684-9981-
dc.rights.holderThe Author(s)-
Appears in Collections:Dept of Mechanical and Aerospace Engineering Research Papers

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