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Article ; Online: Resonance characteristics of tsunami in bay of Japan by the Hunga Tonga-Hunga Ha'apai volcano eruption on 15th January 2022.

Pakoksung, Kwanchai / Suppasri, Anawat / Imamura, Fumihiko

2023 Volume 13, Issue 1, Page(s) 18385

Abstract: The massive eruption of the Hunga Tonga-Hunga Ha'apai (HTHH) volcano in Tonga on 15 January 2022 at 04:15 UTC had a global impact and triggered an atmospheric wave and a tsunami. We first analyzed observation data from meteorological stations and tide ... ...

Abstract	The massive eruption of the Hunga Tonga-Hunga Ha'apai (HTHH) volcano in Tonga on 15 January 2022 at 04:15 UTC had a global impact and triggered an atmospheric wave and a tsunami. We first analyzed observation data from meteorological stations and tide gauges at 12 locations. Low-frequency trends in the observation data were removed by using a high-pass filter. Fourier and wavelet spectral analyses were applied to determine the frequency characteristics of the filtered data. Modal analysis was developed and used to investigate natural oscillation periods based on bathymetry. The results showed that the Lamb wave generated by the atmospheric pressure wave arrived ~ 7 and ~ 44 h after the eruption. The tsunami arrived ~ 11 and ~ 45 h after the eruption, which corresponded to the arrival time of the Lamb wave. The dominant periods of the Lamb waves were ~ 7.7 and ~ 7.5 min, and for the tsunamis they were ~ 9.9 and ~ 28.7 min. The periods derived from the spectral analysis matched the natural oscillation of the eigenperiod derived from the modal analysis, in eight out of the twelve stations. This study provides valuable insight and information regarding the nonseismic and far-field effects of tsunamis generated by volcanic eruptions.
Language	English
Publishing date	2023-10-26
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-45601-6
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Resonance characteristics of tsunami in bay of Japan by the Hunga Tonga-Hunga Ha’apai volcano eruption on 15th January 2022

Kwanchai Pakoksung / Anawat Suppasri / Fumihiko Imamura

Scientific Reports, Vol 13, Iss 1, Pp 1-

2023 Volume 16

Abstract: Abstract The massive eruption of the Hunga Tonga-Hunga Ha’apai (HTHH) volcano in Tonga on 15 January 2022 at 04:15 UTC had a global impact and triggered an atmospheric wave and a tsunami. We first analyzed observation data from meteorological stations ... ...

Abstract	Abstract The massive eruption of the Hunga Tonga-Hunga Ha’apai (HTHH) volcano in Tonga on 15 January 2022 at 04:15 UTC had a global impact and triggered an atmospheric wave and a tsunami. We first analyzed observation data from meteorological stations and tide gauges at 12 locations. Low-frequency trends in the observation data were removed by using a high-pass filter. Fourier and wavelet spectral analyses were applied to determine the frequency characteristics of the filtered data. Modal analysis was developed and used to investigate natural oscillation periods based on bathymetry. The results showed that the Lamb wave generated by the atmospheric pressure wave arrived ~ 7 and ~ 44 h after the eruption. The tsunami arrived ~ 11 and ~ 45 h after the eruption, which corresponded to the arrival time of the Lamb wave. The dominant periods of the Lamb waves were ~ 7.7 and ~ 7.5 min, and for the tsunamis they were ~ 9.9 and ~ 28.7 min. The periods derived from the spectral analysis matched the natural oscillation of the eigenperiod derived from the modal analysis, in eight out of the twelve stations. This study provides valuable insight and information regarding the nonseismic and far-field effects of tsunamis generated by volcanic eruptions.
Keywords	Medicine ; R ; Science ; Q
Language	English
Publishing date	2023-10-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The near-field tsunami generated by the 15 January 2022 eruption of the Hunga Tonga-Hunga Ha'apai volcano and its impact on Tongatapu, Tonga.

Pakoksung, Kwanchai / Suppasri, Anawat / Imamura, Fumihiko

Scientific reports

2022 Volume 12, Issue 1, Page(s) 15187

Abstract: On 15 January 2022 at 04:15 UTC, the Hunga Tonga-Hunga Ha'apai (HTHH) volcano in Tonga produced a massive eruption that triggered a transoceanic tsunami generated by the coupled ocean and atmospheric shock wave produced during the explosion. The tsunami ... ...

Abstract	On 15 January 2022 at 04:15 UTC, the Hunga Tonga-Hunga Ha'apai (HTHH) volcano in Tonga produced a massive eruption that triggered a transoceanic tsunami generated by the coupled ocean and atmospheric shock wave produced during the explosion. The tsunami first reached the coast of Tonga and eventually reached many coasts around the world. This volcano previously underwent a massive eruption in 1100 AD, and an eruption occurs approximately every 1000 years. The 2022 HTHH event provides an opportunity to study a major volcanically generated tsunami that caused substantial damage. In this study, we present a numerical simulation of a tsunami with a state-of-the-art numerical model based on a submarine explosion scenario. We constrain the geometry and magnitude of the explosion energy source based on analyses of pre- and post-event satellite images, which demonstrate that the explosion magnitude varied from 1 to 90 megatons of trinitrotoluene (Mt). Estimated submarine explosion geometries result in a suitable explosion magnitude of approximately 25 Mt, as determined with the waveform from the tide gauge in the time and frequency domains. The tsunami wave first reached the northwestern part of Tonga's Tongatapu within 10 min, with a maximum runup height of approximately 15 m, and covered the whole of Tongatapu within 30 min. Finally, the numerical simulation provides deep insights into the physical volcanic explosion processes and improves our understanding and forecasting capabilities of frequent and catastrophic tsunamis caused by submarine volcanic explosions.
Language	English
Publishing date	2022-09-07
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-19486-w
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Universal health coverage mitigated COVID-19 health-related consequences in Asia Oceania.

Saengtabtim, Kumpol / Tang, Jing / Leelawat, Natt / Egawa, Shinichi / Suppasri, Anawat / Imamura, Fumihiko

International journal of disaster risk reduction : IJDRR

2023 Volume 92, Page(s) 103725

Abstract: The COVID-19 pandemic has been a continual challenge since 2020, and it continues to impact people and industries as a disaster caused by a biological hazard. This study examined universal health coverage (UHC) scores in relation to the performance in ... ...

Abstract	The COVID-19 pandemic has been a continual challenge since 2020, and it continues to impact people and industries as a disaster caused by a biological hazard. This study examined universal health coverage (UHC) scores in relation to the performance in combating COVID-19 in the Southeast Asian region (SEAR) and the Western Pacific region (WPR), along with the State Party Self-Assessment Annual Reporting (SPAR) index under the international health regulations (IHC). The numbers of infections and deaths per million population from December 2019 to June 2022 were used as primary outcomes to measure countries' performance. Countries with UHC scores of 63 or higher had a significantly lower number of infected patients and deaths. In addition, several inter-capacity correlations within the SPAR capacities, including with C8 (the National Health Emergency Framework), as well as a very strong correlation to C4 (Food Safety), C5 (Laboratory), and C7 (Human Resources). Furthermore, C9 (Health Service Provisions) has a very strong correlation to C1 (Legislation and Financing), C2 (International Health Regulation Coordination and a National IHR Focal Point function), and C4 (Food Safety), suggesting that the capability to manage an emerging infectious disease form blocks of capacities. In conclusion, UHC clearly mitigated the health-related consequences of COVID-19 in South-East Asia Region (SEAR) and Western Pacific Region (WPR). Investigating the correlation between the SPAR capacities and UHC is a promising approach for future research, including the importance of the provision of health services, points of entry, and, most importantly, risk communications as critical factors for managing pandemic. This study constitutes a good opportunity to apply the SPAR index to define which capacities correlate with the outcome of the pandemic in terms of infections and deaths.
Language	English
Publishing date	2023-04-28
Publishing country	England
Document type	Journal Article
ZDB-ID	2695877-6
ISSN	2212-4209
ISSN	2212-4209
DOI	10.1016/j.ijdrr.2023.103725
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Article ; Online: Consequences of COVID-19 on Health, Economy, and Tourism in Asia

Kumpol Saengtabtim / Natt Leelawat / Jing Tang / Anawat Suppasri / Fumihiko Imamura

Sustainability, Vol 14, Iss 4624, p

A Systematic Review

2022 Volume 4624

Abstract: Since the beginning of the COVID-19 situation, academic and disaster-related organizations have focused on the severity of COVID-19 and how to prevent the infection. The side effects of COVID-19 also created serious impacts on human lives from multiple ... ...

Abstract	Since the beginning of the COVID-19 situation, academic and disaster-related organizations have focused on the severity of COVID-19 and how to prevent the infection. The side effects of COVID-19 also created serious impacts on human lives from multiple perspectives. This study primarily aims to conduct a systematic review on the COVID-19 impacts from the aspects of health, economy, and tourism, focusing on Asia. We use the preferred reporting items for systematic reviews and meta-analyses as the main tool in conducting the systematic review analysis. The keywords related to the focused aspect are searched based on the two prominent academic journal databases: Web of Science and PubMed. In each aforementioned aspect, the consequences and the main stakeholders who were directly and indirectly affected are explained. Moreover, the connection between the three aspects based on the impact of COVID-19, which still continues to intensify, and strategies to prepare for future pandemic situation are also presented.
Keywords	Asia ; COVID-19 ; COVID-19 consequences ; systematic review ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Characteristics of consecutive tsunamis and resulting tsunami behaviors in southern Taiwan induced by the Hengchun earthquake doublet on 26 December 2006

Cheng, An-Chi / Suppasri, Anawat / Pakoksung, Kwanchai / Imamura, Fumihiko

eISSN: 1684-9981

2023

Abstract: Consecutive M L 7.0 submarine earthquakes occurred offshore of the Hengchun Peninsula, Taiwan, on 26 December 2006. A small tsunami was generated and recorded at tide gauge stations. This important event attracted public interest, as it was generated by ... ...

Abstract	Consecutive M L 7.0 submarine earthquakes occurred offshore of the Hengchun Peninsula, Taiwan, on 26 December 2006. A small tsunami was generated and recorded at tide gauge stations. This important event attracted public interest, as it was generated by an earthquake doublet and produced a tsunami risk for Taiwan. This study analyzed tide gauge tsunami waveforms and numerical simulations to understand the source characteristics and resulting behaviors of tsunamis. The maximum wave heights at the three nearest stations were 0.08 m (Kaohsiung), 0.12 m (Dongkung), and 0.3 m (Houbihu), and only Houbihu recorded the first wave crest as the largest. The tsunami duration was 3.9 h at Dongkung and over 6 h at Kaohsiung and Houbihu. Spectral analyses detected dominant periodic components of spectral peaks on the tsunami waveforms. The period band from 13.6–23.1 min was identified as the tsunami source spectrum, and the approximate fault area for the consecutive tsunamis was estimated to be 800 km 2 , with central fault depths of 20 km (first earthquake, M w 7.0) and 33 km (second earthquake, M w 6.9). The focal mechanisms of the first earthquake, with a strike of 319 ∘ , dip of 69 ∘ , and rake of − 102 ∘ , and the second earthquake, with a strike of 151 ∘ , dip of 48 ∘ , and rake of 0 ∘ , could successfully reproduce the observed tsunami waveforms. Numerical simulations suggested that the tsunami waves were coastally trapped on the south coast of Taiwan during the tsunami's passage. The trapped waves propagated along the coast as edge waves, which repeatedly reflected and refracted among the shelves, interfered with incoming incident wave, and resonated with the fundamental modes of the shelves, amplifying and continuing the tsunami wave oscillation. These results elucidated the generation and consequential behaviors of the 2006 tsunami in southern Taiwan, contributing essential information for tsunami warning and coastal emergency response in Taiwan to reduce disaster risk.
Subject code	333
Language	English
Publishing date	2023-02-03
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: People's Perception of Well-Being during the COVID-19 Pandemic: A Case Study in Japan.

Sasaki, Daisuke / Suppasri, Anawat / Tsukuda, Haruka / Nguyen, David N / Onoda, Yasuaki / Imamura, Fumihiko

International journal of environmental research and public health

2022 Volume 19, Issue 19

Abstract: This study aims to examine people's perception of well-being during the COVID-19 pandemic in Japan and quantitatively clarify key factors towards realizing evidence-based policymaking. In March 2022, 400 participants responded to a survey conducted ... ...

Abstract	This study aims to examine people's perception of well-being during the COVID-19 pandemic in Japan and quantitatively clarify key factors towards realizing evidence-based policymaking. In March 2022, 400 participants responded to a survey conducted through Rakuten Insight. The authors applied an ordinal logistic regression (OLR), followed by principal component analysis (PCA), to create a new compound indicator (CI) to represent people's perception of well-being during the pandemic in addition to ordinary least squares (OLS) regression with a forward-backward stepwise selection method, where the dependent variable is the principal component score of the first principal component (PC1), while the independent variables are the same as the abovementioned OLR. Consequently, while analyzing OLR, some independent variables showed statistical significance, while the CI provided an option to grasp people's perception of well-being. Furthermore, family structure was statistically significant in all cases of OLR and OLS. Moreover, in terms of the standardized coefficients (beta) of OLS, the family structure had the greatest impact on the CI. Based on the study results, the authors advocate that the Japanese government should pay more attention to single-person households affected by the COVID-19 pandemic.
MeSH term(s)	COVID-19/epidemiology ; Government ; Humans ; Japan/epidemiology ; Pandemics ; Perception
Language	English
Publishing date	2022-09-25
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph191912146
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Preliminary Observations and Impact in Japan of the Tsunami Caused by the Tonga Volcanic Eruption on January 15, 2022.

Imamura, Fumihiko / Suppasri, Anawat / Arikawa, Taro / Koshimura, Shunichi / Satake, Kenji / Tanioka, Yuichiro

Pure and applied geophysics

2022 Volume 179, Issue 5, Page(s) 1549–1560

Abstract: The tsunami caused by the Tonga submarine volcanic eruption that occurred at 13:15 Japan Time (JST) on January 15, 2022, exposed a blind spot in Japan's tsunami monitoring and warning system, which was established in 1952 for local tsunamis and expanded ... ...

Abstract	The tsunami caused by the Tonga submarine volcanic eruption that occurred at 13:15 Japan Time (JST) on January 15, 2022, exposed a blind spot in Japan's tsunami monitoring and warning system, which was established in 1952 for local tsunamis and expanded to distant tsunamis after the 1960 Chile tsunami. This paper summarizes how the warning system responded to the unprecedented tsunami, the actual evacuation process, and the damage it caused in Japan. Initially, the tsunami from the volcanic eruption was expected to arrive at approximately midnight with amplitudes of less than 20 cm. However, a series of short waves arrived at approximately 21:00, a few hours earlier than expected. The early arrival of these sea waves coincided with a rapid increase in atmospheric pressure; then, the short-period component was predominant, and the wave height was amplified while forming wave groups. After a 1.2 m tsunami was observed in Amami City in southern Japan at 23:55 JST, the Japan Meteorological Agency issued a tsunami warning/advisory. The tsunami continued, and all advisories were cleared at 14:00 JST on January 16. Information about this tsunami and the response to it are summarized here, including the characteristics and issues of the actual tsunami evacuation situation in each region. There were no casualties, but the issues that emerged included difficulty evacuating on a winter night and traffic congestion due to evacuation by car and under the conditions of the COVID-19 pandemic. In the coastal area, damage to fishing boats and aquaculture facilities was reported due to the flow of the tsunami. In addition, damage to aquaculture facilities, including those producing oysters, scallops, seaweed and other marine products, decreased the supply of marine products, and the economic impact is likely to increase in the future.
Language	English
Publishing date	2022-06-04
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	216719-0
ISSN	1420-9136 ; 0033-4553
ISSN (online)	1420-9136
ISSN	0033-4553
DOI	10.1007/s00024-022-03058-0
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Multi-indicator building vulnerability index for assessing tsunami-induced building damages

Muhaimin Ridwan Wong Mohd / Ahmad Nordila / Syamsidik / Suppasri Anawat / Othman Maidiana

E3S Web of Conferences, Vol 340, p

2022 Volume 04002

Abstract: While relatively uncommon, tsunami typically leads to extreme and devastating impacts to human lives and development at far distances. Various international bodies and academic research have highlighted the importance of understanding risk and its ... ...

Abstract	While relatively uncommon, tsunami typically leads to extreme and devastating impacts to human lives and development at far distances. Various international bodies and academic research have highlighted the importance of understanding risk and its determinants for effective risk management. Currently available methodologies to assess tsunami risk and the effect of vulnerability towards the resulting impact present opportunities for improvement particularly in their adaptability, accuracy and generalisability for pre- and post-disaster applications, as well as across temporal and geographical boundaries. This paper discusses the potential of a methodology to assess tsunami risk for buildings based on their vulnerability level, which in turn is determined through a set of vulnerability indicators. A vulnerability index equation consisting of four indicators namely building materials, number of storeys, coastal protective structures and coastal vegetation was formulated through the Analytical Hierarchy Process. The index is then applied for two major yet distinctly different tsunami events for the purpose of examining potential links between hazard intensity measure, building vulnerability and recorded impacts while also establishing basis for generalisability. While certain correlations can be observed, the findings are still at preliminary stage and thus approaches to further refine the index were proposed.
Keywords	Environmental sciences ; GE1-350
Subject code	720
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Characteristics of consecutive tsunamis and resulting tsunami behaviors in southern Taiwan induced by the doublet earthquakes on 26 December 2006

Cheng, An-Chi / Suppasri, Anawat / Pakoksung, Kwanchai / Imamura, Fumihiko

eISSN: 1684-9981

2022

Abstract: Consecutive M w 7.0 and M w 6.9 submarine earthquakes occurred offshore Hengchun Peninsula, Taiwan on 26 December 2006. A small tsunami was generated, and recorded at tide gauge stations for the first time. This important event attracted public interest ... ...

Abstract	Consecutive M w 7.0 and M w 6.9 submarine earthquakes occurred offshore Hengchun Peninsula, Taiwan on 26 December 2006. A small tsunami was generated, and recorded at tide gauge stations for the first time. This important event attracted public interest as it was generated by doublet sources and demonstrated tsunami risk in Taiwan. This study analyzed tide gauge tsunami waveforms and numerical simulations to understand the source characteristics and resulting tsunami behaviors. The maximum wave heights at three stations were 0.08 m (Kaohsiung), 0.12 m (Dongkung), and 0.3 m (Houbihu), and only Houbihu recorded the first wave crest as the largest. The tsunami durations were 3.9 h at Dongkung, and more than 6 h at Kaohsiung and Houbihu. Spectral analyses detected dominant periodic components of spectral peaks on tsunami waveforms. The period band from 15.5–26.6 min was identified as the tsunami source spectrum, and the approximate source area for the consecutive tsunamis was constrained to be 800 km 2 . Comparing the simulated tsunami waveforms to observed tsunami waveforms showed that the GCMT focal mechanisms explained the observations at all three stations better than the USGS solutions. Numerical simulations based on real and hypothetical bathymetry examined its influence on the transmission of tsunami waves. The results revealed that wave trapping was connected to wave refraction caused by bathymetry. Trapped waves interfered with incident waves at shelf edges amplified tsunami waves and prolonged oscillations, which explained unusual observations recorded by the tide gauges. These elucidate the generation of the consecutive 2006 tsunamis, and consequent tsunami behaviors in southern Taiwan, contributing essential knowledge for tsunami warning and coastal emergency response in Taiwan to reduce disaster risk.
Subject code	551 ; 535
Language	English
Publishing date	2022-04-27
Publishing country	de
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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