SEA LEVEL STATION MONITORING FACILITY

News

Earthquake near East Coast of Honshu, Japan, 7.4M 2025-12-08T14:15Z

Added on: 2025-12-08 22:02:59 by Vanhoorne, Bart

Small waves up to 0.4m can be seen ...

Cyprus Tide Gauge Network "PYTHEAS" Joins IOC Global Monitoring Efforts

Added on: 2025-12-03 08:44:27 by Kokosis, Georgios

The Department of Lands and Surveys (DLS) of Cyprus has successfully incorporated its national tide gauge network, "PYTHEAS," into the Intergovernmental Oceanographic Commission's (IOC) international observation system. This integration significantly boosts global sea-level monitoring and disaster preparedness efforts. ...

Earthquake Mindanao (Philippines), 7.4M 2025-10-10T01:44Z

Added on: 2025-10-10 08:58:30 by Vanhoorne, Bart

Small waves up to 0.25m can be seen in: ...

12 real-time stations added by the Brazilian Coastal Monitoring System (SiMCosta)

Added on: 2025-09-30 21:29:59 by Ella Soares Pereira

The Brazilian Coastal Monitoring System (SiMCosta) aims to establish and maintain an observation network composed of fixed and floating platforms equipped with sensors to monitor essential meteorological and oceanographic variables in coastal zones, providing valuable information on the impacts of climate change along the Brazilian coast. ...

Earthquake Drake Passage, South America, 7.5M 2025-08-22T02:16Z

Added on: 2025-08-22 11:35:18 by Vanhoorne, Bart

Small waves up to 0.25m can be seen in Base Naval Capitan Arturo (Chile). ...

21 real-time stations added from Indonesia, BMKG

Added on: 2025-08-22 11:01:25 by Riama, Nelly

The recent tsunami event near Kamchatka on 29 July 2025 has underscored once again the importance of real-time sea level data sharing for coastal safety and disaster risk reduction ...

Earthquake Kamchatka, Russia, 8.8M 2025-07-29T23:24Z

Added on: 2025-07-30 08:20:00 by Vermaere, Stijn

Waves reaching up to 1.4 m struck different coasts following an 8.8 magnitude earthquake off the coast of Kamchatka, Russia. ...

Earthquake Crete, Greece, 5.9M 2025-05-22T03:19Z

Added on: 2025-05-22 08:52:28 by Vanhoorne, Bart

Small waves up to 0.1m can be seen in Heraklion (Greece).

Earthquake Drake Passage, Argentinia, 7.5M 2025-05-02T12:59Z

Added on: 2025-05-02 22:28:13 by Vanhoorne, Bart

Waves up to 0.5m can be seen in Vernadsky Faraday (Antarctica).

Automatically QC research sea level data and new API released

Added on: 2025-03-27 14:21:57 by Vermaere, Stijn

The automatically quality-controlled research sea level dataset is now live, together with a new API.

Geo-INQUIRE webinar: SLSMF API, with real-time and daily automated quality-controlled sea level research data

Added on: 2025-03-26 10:17:24 by Vanhoorne, Bart

Online training event on the new Sea Level Station Monitoring Facility (SLSMF) API, with real-time and daily automated quality-controlled sea level research data.

Earthquake Off West Coast of South Island, New Zealand, 6.9M 2025-03-25T01:43Z

Added on: 2025-03-25 09:24:51 by Vanhoorne, Bart

Small waves up to about 0.2m can be seen at Puysegur Welcome Bay (New Zealand)

Earthquake North Of Honduras, 7.6M 2025-02-08T23:23Z

Added on: 2025-02-09 11:47:54 by Vanhoorne, Bart

Small waves up to about 0.3m can be seen at Isla Mujeres (Mexico)

Statistics for the SLSMF for 2024

Added on: 2025-01-04 12:01:26 by Vanhoorne, Bart

At the end of 2024, about 1249 active stations were tracked (about 1234 in 2023).

Earthquake Vanuatu, 7.3M 2024-12-17T01:47Z

Added on: 2024-12-18 17:35:31 by Vanhoorne, Bart

Small waves up to 0.6m can be seen at Port Vila (Vanuatu)

Earthquake Tonga Islands (New Zealand), 6.8M 2024-10-01T20:06Z

Added on: 2024-10-01 22:19:05 by Vanhoorne, Bart

Waves up to 2.5m can be seen at DART buoys near Tonga (New Zealand) ...

Earthquake Kyushu (Japan), 7.1M 2024-08-08T07:42Z

Added on: 2024-08-08 14:48:40 by Vanhoorne, Bart

Waves up to 1m can be seen at Aburatsu, Tosashimizu and Kushimoto (Japan) ...

Earthquake near the coast of central Peru, 7.2M 2024-06-28T05:37Z

Added on: 2024-06-28 09:02:15 by Vanhoorne, Bart

Waves up to 0.4m can be seen at Chala, Arequipa (Peru)

Statistics for the SLSMF for 2023

Added on: 2024-01-24 15:45:18 by Vanhoorne, Bart

At the end of 2023, about 1234 active stations were tracked (about 1043 in 2022).

Webserver infrastructure updated

Added on: 2024-01-03 15:31:05 by Vanhoorne, Bart

The newest versions of Apache (web server) and PHP (scripting engine) have now been installed

Background

The objective of this service is

to provide information about the operational status of global and regional networks of real time sea level stations
to provide a display service for quick inspection of the raw data stream from individual stations.

This web-site initially focused on operational monitoring of sea level measuring stations in Africa and was developed from collaboration between Flanders Marine Institute (VLIZ) and the ODINAFRICA project of IODE. The site has since been expanded to a global station monitoring service for real time sea level measuring stations that are part of IOC programmes i.e. (i) the Global Sea Level Observing System Core Network; and (ii) the networks under the regional tsunami warning systems in the Indian Ocean (IOTWS), North East Atlantic & Mediterranean (NEAMTWS), Pacific (PTWS) and the Caribbean (CARIBE-EWS).

Long-term mean sea level (MSL) data

This GLOSS data center focusses on collecting and redistributing high frequency, relative sea level data in real-time.
Most stations provide values every minute and are updated each 5 minutes.
The GLOSS data centers at the Permanent Service for Mean Sea Level (PSMSL), the British Oceanographic Data Center (BODC) and the University of Hawaii Sea Level Center (UHSLC) perform the additional processing steps needed to calculate long-term mean sea level (MSL) data at hourly, daily, monthly and yearly averages.
Where available, the station detail page links to these mean sea level data series

Citation

Flanders Marine Institute (VLIZ); Intergovernmental Oceanographic Commission (IOC) (2026): Sea level station monitoring facility. Accessed at http://www.ioc-sealevelmonitoring.org on 2026-02-03 at VLIZ. DOI: 10.14284/482

Data Policy & disclaimer

Please read the disclaimer.

Data providers (182)

Agence Nationale de l'Aviation Civile et de la Météorologie ( Senegal ) [list stations]
Anguilla Department of Disaster Management ( Anguilla ) [list stations]
Antigua & Barbuda Meteorological Services ( Antigua & Barbuda ) [list stations]
Aqaba Marine Reserve, Research and studies division ( Jordan ) [list stations]
Armada Argentina Servicio de Hidrografía Naval ( Argentina ) [list stations]
Asian Disaster Preparedness Center ( Thailand ) [list stations]
Bahamas Department of Meteorology ( Bahamas ) [list stations]
Barbados Meteorological Services ( Barbados ) [list stations]
Brazilian Coastal Monitoring System (SiMCosta) - Universidade Federal do Rio Grande ( Brasil ) [list stations]
British Antartic Survey ( UK ) [list stations]
Campbell Scientific ( Costa Rica ) [list stations]
Caribbean Community Center for Climate Change ( Belize ) [list stations]
Caribbean Community Climate Change Centre ( Trinidad and Tobago ) [list stations]
Caribbean Institute for Meteorology & Hydrology ( Barbados ) [list stations]
Central American Tsunami Advisory Center ( Nicaragua ) [list stations]
Central Weather Administration ( Taiwan ) [list stations]
Centre de Recherches Océanographiques and the Service Hydrographique et de Cartographie ( Senegal ) [list stations]
Centre National pour la Recherche Scientifique et Technique ( Marocco ) [list stations]
Centro de Investigación Científica y de Educación Superior de Ensenada ( Mexico ) [list stations]
Channel Coastal Observatory ( UK ) [list stations]
China Meteorological Administration ( China ) [list stations]
Civil Aviation Authority ( Oman ) [list stations]
Coastal Zone Management Unit ( Barbados ) [list stations]
Collectivité de Saint Martin ( France ) [list stations]
Collectivité Territoriale de Martinique (France) [list stations]
Comision Permanente de Contingencias ( Honduras ) [list stations]
Commissariat à l'Energie Atomique ( France ) [list stations]
Cyprus Marine and Maritime Institute ( Cyprus ) [list stations]
Cyprus Oceanography Center ( Cyprus ) [list stations]
Cyprus University of Technology ( Cyprus ) [list stations]
Danish Meteorological Institute ( Denmark ) [list stations]
Danish National Space Centre, Technical University of Denmark ( Denmark ) [list stations]
Departamento Meteorologico Aruba ( Aruba ) [list stations]
Department of Agriculture, Fisheries and Food ( Ireland ) [list stations]
Department of Disaster Management and Emergencies, Ministry of Home Affairs ( Turks & Caicos Islands ) [list stations]
Department of Geology, Mines and Water Resources ( Vanuatu ) [list stations]
Department of Geophysics, Faculty of Science, University of Zagreb ( Croatia ) [list stations]
Department of Land and Survey ( Tanzania ) [list stations]
Department of Lands and Surveys ( Cyprus ) [list stations]
Department of Meteorology and Hydrology ( Myanmar ) [list stations]
Department of Public Safety Communications ( Cayman Islands ) [list stations]
Department of Surveying and Mapping ( Malaysia ) [list stations]
Department of Water Resources ( Gambia ) [list stations]
Dipartimento Scienze della Terra e Geoambientali - Università di Bari ( Italy ) [list stations]
Direção-Geral do Território ( Portugal ) [list stations]
Dirección de Hidrografía y Navegación (Perú) [list stations]
Dirección General Marítima ( Colombia ) [list stations]
Direction des Territoires, de l'Alimentation et de la Mer ( France ) [list stations]
Direction générale de la météorologie ( Madagascar ) [list stations]
Directorate General Meteorology and Air Navigation ( Oman ) [list stations]
Dominica Meteorological Service ( Dominica ) [list stations]
Empresa de pesquisa agropecuária e extensão rural de Santa Catarina ( Brasil ) [list stations]
Federal Service of Russia for Hydrometeorology and Environmental Monitoring ( Russia ) [list stations]
Fiji Meteorological Service ( Fiji ) [list stations]
Fisheries and Oceans Canada ( Canada ) [list stations]
General Directorate of Mapping ( Turkey ) [list stations]
GeoForschungsZentrum ( Germany ) [list stations]
Geospacial Agency of Indonesia ( Indonesia ) [list stations]
German Federal Waterways and Shipping Administration ( Germany ) [list stations]
GNS Science ( New Zealand ) [list stations]
Goddard Earth Science and Technology Center, University of Maryland, Baltimore County ( USA ) [list stations]
Gwadar Port Authority and Hydrographic Department (Pakistan) [list stations]
Hartebeesthoek Radio Astronomy Observatory ( South Africa ) [list stations]
Hazard Management Cayman Islands ( UK ) [list stations]
Hellenic Navy Hydrographic Service ( Greece ) [list stations]
Hong Kong Observatory ( Hong Kong - China ) [list stations]
Hydrographic Department of Bangladesh Navy ( Bangladesh ) [list stations]
Hydrographic Department of the National Cartographic Center ( Iran ) [list stations]
Hydro-meteorological and Environmental Station Network Center ( Vietnam ) [list stations]
Icelandic Coast Guard, Hydrographic Department ( Iceland ) [list stations]
IEST Anosy [list stations]
Indian National Centre for Ocean Information Services ( India ) [list stations]
Informationstechnikzentrum Bund ( Germany ) [list stations]
Institut de Physique du Globe de Paris, Observatoire Volcanologique et Sismologique de Guadeloupe ( France ) [list stations]
Institut de Recherche pour le Développement ( France ) [list stations]
Institute of Oceanography and Fisheries ( Croatia ) [list stations]
Instituto Brasileiro de Geografia e Estatística ( Brasil ) [list stations]
Instituto de Geociencias- Universidad de Panamá ( Panama ) [list stations]
Instituto Español de Oceanografía ( Spain ) [list stations]
Instituto Geográfico Nacional ( Spain ) [list stations]
Instituto Hidrográfico ( Portugal ) [list stations]
Instituto Nacional de Hidrografia e Navegação ( Mozambique ) [list stations]
Instituto Nacional de Meteorologia e Geofisica ( Cabo Verde ) [list stations]
Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología ( Guatemala ) [list stations]
Instituto Nicaragüense de Estudios Territoriales - Hydrological Unit ( Nicaragua ) [list stations]
Instituto Oceanográfico de la Armada ( Ecuador ) [list stations]
Instituto Português do Mar e da Atmosfera ( Portugal ) [list stations]
International Tsunami Information Center Caribbean Office ( USA ) [list stations]
Israel Oceanographic and Limnological Research Ltd ( Israel ) [list stations]
Istituto Nazionale di Geofisica e Vulcanologia ( Italy ) [list stations]
Istituto Superiore per la Protezione e la Ricerca Ambientale ( Italy ) [list stations]
Jamaican Meteorological Service ( Jamaica ) [list stations]
Japan Coast Guard ( Japan) [list stations]
Japan Meteorological Agency ( Japan ) [list stations]
Joint Research Centre ( Europe ) [list stations]
Kandilli Observatory and Earthquake Research Institute ( Turkey ) [list stations]
Karachi Port Trust ( Pakistan ) [list stations]
Kenya Marine and Fisheries Research Institute ( Kenya ) [list stations]
Kepala Badan Meteorologi, Klimatologi, dan Geofisika ( Indonesia ) [list stations]
Kiribati Met Office ( Kiribati ) [list stations]
Korea Environmental Science & Technology Institute ( Korea ) [list stations]
Korea Hydrographic and Oceanographic Administration ( Korea ) [list stations]
Korea-South Pacific Ocean Research Center ( Korea ) [list stations]
Kuwait Institute for Scientific Research ( Kuwait ) [list stations]
Laboratoire d'Etudes en Géophysique et Océanographie Spatiales ( France ) [list stations]
Land and Surveys Division, Hydrographic Unit ( Trinidad and Tobago ) [list stations]
Land Information New Zealand ( New Zealand ) [list stations]
Madagascar National Oceanographic Data Center [list stations]
Malaysian Meteorological Department ( Malaysia) [list stations]
Maldives Meteorological Department ( Maldives ) [list stations]
Marine Hydrophysical Institute ( Ukraine ) [list stations]
Marine Institute ( Ireland ) [list stations]
Maritieme Dienstverlening en Kust ( Belgium ) [list stations]
Maritime and Port Authority of Singapore - The Hydrographic Office ( Singapore ) [list stations]
Mauritius Meteorological Services ( Mauritius ) [list stations]
Meteorological Department Curaçao ( Curaçao ) [list stations]
Meteorological Services Division ( Singapore ) [list stations]
Ministerio de Medio Ambiente y Recursos Naturales ( El Salvador ) [list stations]
Ministry of Maritime Affairs and Fisheries of the Republic of Indonesia ( Indonesia ) [list stations]
Ministry of the Environment and Forests ( Romania ) [list stations]
Namibian Port Authority ( Namibia ) [list stations]
National Antarctic Scientific Centre ( Ukraine ) [list stations]
National Aquatic Resources Research and Development Agency ( Sri Lanka ) [list stations]
National Centre for Geophysical Research ( Lebanon ) [list stations]
National Emergency Management Agency ( St. Kitts & Nevis ) [list stations]
National Emergency Management Office ( Saint Vincent & Grenadines ) [list stations]
National institute for Earth Physics ( Romania ) [list stations]
National Institute for Marine Research and Development ( Romania ) [list stations]
National Institute of Oceanographic and Fisheries ( Egypt ) [list stations]
National Institute of Oceanography and Fisheries, Alexandria ( Egypt ) [list stations]
National Mapping and Resource Information Authority ( Philippines ) [list stations]
National Meteorological Service of Belize ( Belize ) [list stations]
National Observatory of Athens ( Greece ) [list stations]
National Ocean Service-NOAA ( USA ) [list stations]
National Oceanography Centre ( UK ) [list stations]
National Technical University of Athens ( Greece ) [list stations]
National Tidal Centre/Australian Bureau of Meteorology ( Australia ) [list stations]
Navy Hydrography Center - Marine Meteorological Service ( Brasil ) [list stations]
Nigerian Institute for Oceanography and Marine Research ( Nigeria ) [list stations]
Norwegian Hydrographic Service ( Norway ) [list stations]
OceanWise [list stations]
Office National de la Météorologie ( Mauritania ) [list stations]
Office of Public Works ( Ireland ) [list stations]
Office of the Port Director ( Northern Marianas, USA ) [list stations]
Oficina Nacional de Meteorología (Dominican Republic) [list stations]
Pacific Tsunami Warning Center ( USA ) [list stations]
Pakistan Navy Hydrographic Department ( Pakistan) [list stations]
Port Autonome de Nouakchott ( Mauritania ) [list stations]
Port Autonome de Pointe Noire ( Republic of Congo ) [list stations]
Port of Djibouti ( Djibouti ) [list stations]
Principauté de Monaco - Direction de l'Environnement ( Monaco ) [list stations]
Puerto Rico Seismic Network ( USA ) [list stations]
Puertos del Estado ( Spain ) [list stations]
Rijkswaterstaat ( Netherlands ) [list stations]
Royal Thai Navy ( Thailand ) [list stations]
Saint Lucia Met Service ( Saint Lucia ) [list stations]
Service hydrographique et océanographique de la marine ( France ) [list stations]
Service Maritime et de Navigation d´Haiti ( Haïti ) [list stations]
Servicio Hidrográfico y Oceanográfico de la Armada ( Chile ) [list stations]
Seychelles National Meteorological Services ( Seychelles ) [list stations]
Smithsonian Marine Station at Fort Pierce ( USA ) [list stations]
Smithsonian Tropical Research Institute ( USA ) [list stations]
Societé National de Raffinage ( Cameroon ) [list stations]
South African Hydrographic Office ( South Africa ) [list stations]
State Meteorological Agency ( Spain ) [list stations]
Survey of Bangladesh, Ministry of Defense ( Bangladesh ) [list stations]
Swedish Maritime Administration ( Sweden ) [list stations]
Swedish Meteorological and Hydrological Institute ( Sweden ) [list stations]
Tanzania Ports Authority ( Tanzania ) [list stations]
UK Hydrographic Office ( UK ) [list stations]
UNAVCO by EarthsScope ( USA ) [list stations]
Universidad de Puerto Rico ( Puerto Rico ) [list stations]
Universidad Nacional Autónoma de México ( Mexico ) [list stations]
Universidad Nacional Costa Rica, SINAMOT ( Costa Rica ) [list stations]
University of Balearic Islands ( Spain ) [list stations]
University of Bologna - Dipartimento di Fisica e Astronomia "Augusto Righi" [list stations]
University of French Polynesia ( France ) [list stations]
University of Hawaii Sea Level Center ( USA ) [list stations]
University of Malta,Oceanography Malta Research Group within the Department of Geosciences ( Malta ) [list stations]
Yap Weather Service Office ( Federated States of Micronesia ) [list stations]
Yemen Gulf of Aden Ports Corporation ( Yemen ) [list stations]
Yildiz Technical University ( Turkey ) [list stations]