Alfredo Mahar Francisco Lagmay

University of the Philippines System

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John Kenneth Suarez

University of the Philippines System

Joy Santiago

University of the Philippines System

Rodrigo Narod Eco

University of the Philippines System

Iris Jill Ortiz

University of the Philippines Diliman

Gianluca Norini

Institute of Environmental Geology and Geoengineering

John Phillip Lapidez

The University of Tokyo

Dakila Aquino

Nationwide Mutual Insurance Company (United States)

Helmut Brückner

University of Cologne

Lia Anne Gonzalo

University of the Philippines Diliman

Vicente Malano

Philippine Medical Association

Cooperative Institutions

University of the Philippines Diliman

University of the Philippines System

University of the Philippines Los Baños

Instituto Volcanológico de Canarias

Instituto Tecnológico y de Energías Renovables

Centre National de la Recherche Scientifique

Nationwide Mutual Insurance Company (United States)

University of Cologne

Tohoku University

Tufts University

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Effects of basement, structure, and stratigraphic heritages on volcano behavior

Eos (2006)

Alfredo Mahar Francisco Lagmay

Effective natural hazard mitigation requires that the science surrounding geophysical events be thoroughly explored. With millions of people living on the flanks of volcanoes, understanding the parameters that effect volcanic behavior is critically important. In particular, basements can influence the occurrence of volcanic eruptions and landslides. This control by the substrate on volcano behavior usually has been considered questionable or less important than the conditions of the deep magma source. However, due to recent findings, this view is changing, specifically with regard to approaches in assessing volcanic hazards.

Volcanic hazards

Basement

10.1029/2006eo230008

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Citations (2)

Delft3D Storm Surge Simulation of Typhoon Haiyan for Projection of Coastal Inundation in the Visayas Islands, Philippines

EGUGA (2015)

John Kenneth Suarez K. M. Cabacaba Nophi Ian Biton Camille Cuadra Joy Santiago

Typhoon

Storm Surge

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Tectonics control over instability of volcanic edifices in transtensional tectonic regimes

EGUGA (2009)

Gianluca Norini Lucía Capra Alfredo Mahar Francisco Lagmay Marina Manea Gianluca Groppelli

Transtension

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Geological hazards of SW Natib Volcano, site of the Bataan Nuclear Power Plant, the Philippines

Geological Society London Special Publications (2012)

Alfredo Mahar Francisco Lagmay Raymond S. Rodolfo Hillel B. Cabria Jesús M. Soria Peter B. Zamora

Abstract The SW sector of Mount Natib, a potentially active volcano in the Bataan volcanic arc in western Luzon, is the site of a mothballed nuclear power plant that members of the national legislature have proposed to activate. Detailed geological fieldwork was conducted to assess the capability of the volcano and to identify any volcanic hazards it might pose to the nuclear plant. The nearest eruptive centre is 5.5 km away from the plant. SW Natib Volcano is underlain by lava flows, lahar deposits and at least six pyroclastic density current (PDC) deposits, three directly underlying the nuclear reactor facility. A fault trending N30°E is aligned with the Lubao Fault, a capable fault NE of the volcanic edifice. Radon emissions at the traces of these faults are high and comparable to those at known active faults. An associated thrust fault at the nuclear site cuts through lahars up to the ground surface. The results presented here can be used for general hazard preparedness of local communities, and may assist the government to decide whether or not to recommission the nuclear power plant.

Volcanic hazards

Geologic hazards

10.1144/sp361.13

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Citations (8)

Deformed symmetrical volcanoes

Geology (2005)

Gianluca Norini Alfredo Mahar Francisco Lagmay

Research Article| July 01, 2005 Deformed symmetrical volcanoes G. Norini; G. Norini 1Dipartimento di Scienze della Terra—A. Desio, Università degli Studi di Milano, via Mangiagalli 34, 20133 Milano, Italy Search for other works by this author on: GSW Google Scholar A.M.F. Lagmay A.M.F. Lagmay 2National Institute of Geological Science, Velasquez Street, Corner C.P. Garcia, University of the Philippines, Quezon City 1101, Philippines Search for other works by this author on: GSW Google Scholar Author and Article Information G. Norini 1Dipartimento di Scienze della Terra—A. Desio, Università degli Studi di Milano, via Mangiagalli 34, 20133 Milano, Italy A.M.F. Lagmay 2National Institute of Geological Science, Velasquez Street, Corner C.P. Garcia, University of the Philippines, Quezon City 1101, Philippines Publisher: Geological Society of America Received: 28 Jan 2005 Revision Received: 18 Mar 2005 Accepted: 23 Mar 2005 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2005) 33 (7): 605–608. https://doi.org/10.1130/G21565.1 Article history Received: 28 Jan 2005 Revision Received: 18 Mar 2005 Accepted: 23 Mar 2005 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation G. Norini, A.M.F. Lagmay; Deformed symmetrical volcanoes. Geology 2005;; 33 (7): 605–608. doi: https://doi.org/10.1130/G21565.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Analog modeling of volcanic cones traversed by strike-slip faulting was conducted, and the cones were analyzed for deformation characteristics. The study shows that symmetrical volcanoes that have undergone basal strike-slip offset may be deformed internally without manifesting any change in their conical shape. Volcanoes deformed by strike-slip faulting may already have well-developed fractures in their interior, yet still appear as a symmetrical cone, exhibiting concentric contours when viewed on a topographic map. Moreover, slight changes in the basal shape of the cone induced by strike-slip movement can be restored by the relatively faster resurfacing and reshaping processes from the deposition of younger eruptive products. These findings pose a subtle but significant point in the assessment of volcanic landslide hazards: not all perfect cones are undisturbed. The detection of concealed deformation is important because fractures induce further instability in volcanoes and act as slip planes during volcano-collapse events. There are many examples of symmetrical volcanoes in nature. The faultless appearance of such perfect cones can be misleading, which requires careful attention in hazards assessment. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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10.1130/g21565.1

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Citations (37)

Learning from the past in moving to the future: Invest in communication and response to weather early warnings to reduce death and damage

Climate Risk Management (2022)

Erin Coughlan de Perez Kristoffer B. Berse Lianne Angelico C. Depante Evan Easton‐Calabria Elton Pierre R. Evidente

As climate change increases the frequency and intensity of extreme weather events, governments and civil society organizations are making large investments in early warning systems (EWS) with the aim to avoid death and destruction from hydro-meteorological events. Early warning systems have four components: (1) risk knowledge, (2) monitoring and warning, (3) warning dissemination and communication, and (4) response capability. While there is room to improve all four of these components, we argue that the largest gaps in early warning systems fall in the latter two categories: warning dissemination/communication and response capability. We illustrate this by examining the four components of early warning systems for the deadliest and costliest meteorological disasters of this century, demonstrating that the lack of EWS protection is not a lack of forecasts or warnings, but rather a lack of adequate communication and lack of response capability. Improving the accuracy of weather forecasts is unlikely to offer major benefits without resolving these gaps in communication and response capability. To protect vulnerable groups around the world, we provide recommendations for investments that would close such gaps, such as improved communication channels, impact forecasts, early action policies and infrastructure. It is our hope that further investment to close these gaps can better deliver on the goal of reducing deaths and damages with EWS.

Extreme Weather

Early warning system

Investment

Risk Communication

10.1016/j.crm.2022.100461

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Citations (16)

National Scale Rainfall Map Based on Linearly Interpolated Data from Automated Weather Stations and Rain Gauges

EGUGA (2014)

Jenalyn Alconis Rodrigo Narod Eco Alfredo Mahar Francisco Lagmay Ivan Lester Saddi Candeze Mongaya

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Shallow landslide susceptibility mapping using high-resolution topography for areas devastated by super typhoon Haiyan

Landslides (2015)

Maricar Rabonza Raquel Felix Alfredo Mahar Francisco Lagmay Rodrigo Narod Eco Iris Jill Ortiz

Typhoon

Debris flow

10.1007/s10346-015-0626-x

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Citations (22)

Flood fragility and vulnerability functions for residential buildings in the Province of Leyte, Philippines

Journal of Flood Risk Management (2024)

Isaac Besarra Aaron Opdyke Diocel Harold Aquino Joy Santiago Jerico E. Mendoza

Abstract The Philippines experiences frequent flooding, but, despite expansive tools for risk reduction, there remain gaps in understanding generalised relationships between flood events and damage to residential structures for regions outside the nation's capital. This gap has limited the ability to model flood risk and damage without robust functions to link hazards and housing vulnerability. This research draws on 394 household surveys to empirically derive a suite of flood fragility and vulnerability functions for residential structures in the Province of Leyte for light material, elevated light material and masonry structures. The results showed that masonry construction was more resilient to floods compared to light material counterparts. Elevated light material structures also exhibited lower damages at low inundations but tend to fail abruptly at flood depths greater than 3 m. By empirically deriving flood damage functions, the findings contribute to a more localised approach to quantifying housing vulnerability and risk that can be used for catastrophe and risk modelling, with applications for government agencies, the insurance industry and disaster risk researchers. This research lays the foundation for future flood risk mapping with growing significance under climate change.

Vulnerability

10.1111/jfr3.13043

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Multi-hazard probability assessment in Quinali A Watershed, Albay, Philippines

Progress in Disaster Science (2025)

Jerico E. Mendoza Gifford Jay L. Agudo Alfredo Mahar Francisco Lagmay Juan M. Pulhin Rex Victor O. Cruz

10.1016/j.pdisas.2025.100408

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