CITSU

Tsunami Inundation Maps (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
Tongoy Ed.2019 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.2018 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
Pelluhue-Curanipe Ed.2018 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
Curaco de Vélez Ed.2019 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 agency 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 duty, SHOA started the implementation of the CITSU Project in 1997 (Inundation 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 event of near field tsunamigenic events.
In the field of prevention and mitigation of the impact of tsunamis, the inundation maps are directly linked to urban planning, carried out by the municipal authority, and 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 Response Plan in the event of a Tsunami.

Consideration:

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

Representation of the inundation

Currently, from the information available for public download (PDF and KMZ), the KMZ file allows displaying the inundation in the form of a line or an area, depending on whether the consulted CITSU corresponds to the old format (prior to 2011) or new format (after 2011), respectively. For this, the Google Earth software is necessary, from which you can consult the inundation delimited in the CITSU. For the new format, the difference is in the levels of depth and transparency on aerial images that are now available in this application. In addition, a link to FAQs is provided on the Website, which allows access to the inundation KMZ file, directly on the Google Maps map server, from any computer or mobile device with an Internet connection, and without the need to have any additional software installed.
It is worth mentioning that this information should only be considered as a reference, especially altitude regarding sea level, given that the CITSU are referred to the Mean Sea Level with high accuracy, while Google Earth presents general altitudes, therefore, not always equal.

Numerical simulation of tsunamis: conceptual aspects

To quantitatively assess the tsunami risk of tectonic origin in coastal areas, interdisciplinary research has been necessary in seismology, geology, geophysics, and oceanography, including the review of historical sources. Within this context, the modeling of tsunamis has been used to discriminate between different possible scenarios (i.e. source location and rupture mechanisms) that may affect a region, elaborating an Inundation Map for the most extreme seismic event, either known or probable.
Currently, numerical simulation is the best geophysical and hydrodynamic analysis technique available to study the tsunami risk in areas where historical records are insufficient. The model applied to develop the CITSU project, COMCOT (Cornell Multi-Grid Coupled Tsunami Model) designed by Dr. S.N. Seo, based on the Shuto's model (August 10, 1993) and Yongsik Cho (August 10, 1993), at the School of Civil and Environmental Engineering of the Cornell University.
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