CITSU

Tsunami Flood Letters (CITSU)

Arica Ed.2012 KMZ MAPA
Pisagua Ed.2014 KMZ MAPA
Iquique Ed.2012 KMZ MAPA
Tocopilla Ed.2012 KMZ MAPA
Michilla Ed.2018 KMZ MAPA
Mejillones Ed.2012 KMZ MAPA
Antofagasta Ed.2013 KMZ MAPA
Antofagasta Sur - Caleta Coloso Ed.2013 KMZ MAPA
Taltal Ed.2012 KMZ MAPA
Chañaral Ed.2014 KMZ MAPA
Caldera - Calderilla - Bahía Inglesa Ed.2013 KMZ MAPA
Huasco Ed.2015 KMZ MAPA
Coquimbo - La Serena Ed.2015 KMZ MAPA
Los Vilos Ed.2017 KMZ MAPA
Papudo Ed.2017 KMZ MAPA
Zapallar - Cachagua - La Laguna - Maintencillo Ed.2015 KMZ MAPA
Quintero - Ventana - Horcón Ed.2011 KMZ MAPA
Concón - Ritoque Ed.2012 KMZ MAPA
Valparaíso - Viña del Mar Ed.2012 KMZ MAPA
Laguna Verde Ed.2017 KMZ MAPA
Quintay Ed.2018 KMZ MAPA
Bahía Cumberland Ed.2013 KMZ MAPA
Pascua Hanga Roa - Hanga Pico Ed.2006 KMZ MAPA
Pascua Hanga Hotuiti Ed.2006 KMZ MAPA
Pascua La Perouse Anakena Ed.2006 KMZ MAPA
Algarrobo Ed.2000 KMZ MAPA
Las Cruces - San Sebastián - Cartagena Ed.2018 KMZ MAPA
San Antonio Ed.2014 KMZ MAPA
Pichilemu Ed.2014 KMZ MAPA
Constitución Ed.2016 KMZ MAPA
Cobquecura Ed.2016 KMZ MAPA
Boca Itata - Perales Ed.2016 KMZ MAPA
Pingueral - Dichato - Coliumo Ed.2016 KMZ MAPA
Bahías Concepción y San Vicente Ed.2013 KMZ MAPA
Tomé - Lirquén - Penco Ed.2013 KMZ MAPA
Sector Isla de los Reyes Ed.2013 KMZ MAPA
Talcahuano - San Vicente Ed.2013 KMZ MAPA
Coronel Ed.2013 KMZ MAPA
Lota Ed.2013 KMZ MAPA
Chivilingo - Laraquete - Arauco Ed.2017 KMZ MAPA
Tubul - Llico - Lavapié Ed.2017 KMZ MAPA
Lebu Ed.2018 KMZ MAPA
Tirúa Ed.2015 KMZ MAPA
Puerto Saavedra Ed.2014 KMZ MAPA
Corral Ed.2014 KMZ MAPA
Maullín Ed.2016 KMZ MAPA
Ancud Ed.2015 KMZ MAPA
Quellón Ed.2015 KMZ MAPA
Puerto Aysén Ed.2018 KMZ MAPA
Chacabuco Ed.2007 KMZ MAPA
Punta Arenas Ed.2016 KMZ MAPA
Porvenir Ed.2017 KMZ MAPA
Puerto Williams Ed.2016 KMZ MAPA

Introduction

The Hydrographic and Oceanographic Service of the Navy (SHOA) is the technical, permanent, and official entity of the state, responsible for the functioning, operation, and maintenance of the National Tsunami Warning System (SNAM).
As a fundamental element of support to its own operational duties, SHOA started the implementation of the Project CITSU in 1997 (Flood Maps for the Coasts of Chile). This tool allows defining the maximum flood levels expected for the main urban and port areas in the coasts of Chile, in the occurrence of an earthquake with tsunamigenic characteristics.
In the field of prevention and mitigation of the impact of tsunamis, the flood charts are directly linked to urban planning, carried out by the municipal authority, and also to the development of evacuation, and civil protection plans. These tasks are supervised by the National Emergency Office of the Ministry of Interior (ONEMI) in every city, through the Regional Offices for Civil Protection and Emergency (OREMI), and Local Emergency Committees, following basic methodology for the elaboration of a Community Plan for Response in the event of a Tsunami.

Consideration:

In general, Tsunami Inundation Maps (CITSU) developed by this Service represent a known or expected extreme event, depending on the circumstances.
Since 2011, the presentation format for the CITSU has changed, showing the flooded area in depth inundation levels in meters, and the topographic surface in hillshade, to achieve a better interpretation of this cartographic product.

Flood lines in KMZ format

From the KMZ published files, it is possible to obtain the flood line of each respective Tsunami Flood Map (CITSU), easily graphed using Google Earth. To visualize them, you must first install this software in your computer. The graphed flood lines must be considered only as reference, specially the information regarding the altitude in relation to the sea level, given that the flood maps are referred to the mean sea level with a high level of accuracy, while Google Earth presents very general altitudes, therefore, they don’t always match. The official information about the flood charts has been delivered to the respective Regional Governments with an explanatory report about its development.
To know the official information regarding the flood areas and their collection, CITSU and its corresponding explanatory memory should be reviewed.

Numerical simulation of tsunamis: conceptual aspects

To quantitatively assess the risk of tectonic originated tsunamis in coastal areas, it has been necessary to carry out interdisciplinary research in seismology, geology, geophysics, and oceanography, including the review of historical sources. Within this context, the modeling of tsunamis has been utilized to discriminate between possible scenarios (i.e. source location and rupture mechanisms) that may affect a particular region, elaborating a flood map for the most likely seismic event.
Currently, the numerical simulation is the best geophysical and hydrodynamic analysis technique available to study the risk of tsunami in the areas where historical records are insufficient. The model applied to develop the CITSU project, TSUNAMI-N, corresponds to the TIME project (Tsunami Inundation Modelling Exchange) of the IOC, (Intergovernmental Oceanographic Commission) designed by Dr. Nuobo Shuto at the Tohoku University Disaster Control and Research Center, Japan (IUGG/IOC, 1997).
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