2 nd MEETING OF THE IHO TIDAL AND WATER LEVEL GROUP 27-29 APRIL 2010, STAVANGER, NORWAY CHILEAN SEA LEVEL NETWORK TSUNAMI FEBRUARY 27TH-2010 TSUNAMI SIGNALS IN A SEA LEVEL REGISTER Juan Fierro C.
Lecture Overview Graphs of Tsunami Waves Sea Level Registers Rate of Changes of Sea Level General Notes for discussion
Sea Level Register 26-28 Feb 2010 Arica ARICA IQUIQUE 20º ANTOFAGASTA Valparaíso I. DE PASCUA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO 30º CORRAL 40º PTO. MONTT ANCUD PTO. CHACABUCO SAN PEDRO 50º PTA. ARENAS Ancud SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. WILLIAMS Sea level Heights referred to CD Local Time PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 60ºS 105ºW 95º 85º 75º 65º 55º
Sea Level Register 26-28 Feb 2010 San Félix Island Chilean Islands ARICA IQUIQUE 20º ANTOFAGASTA Eastern Island I. DE PASCUA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO CORRAL 30º 40º PTO. MONTT ANCUD PTO. CHACABUCO SAN PEDRO 50º PTA. ARENAS PTO. WILLIAMS Sea level Heights referred to CD Local Time SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 60ºS 105ºW 95º 85º 75º 65º 55º
Sea Level Register 26-28 Feb 2010 Puerto Montt Inland Waters ARICA IQUIQUE 20º ANTOFAGASTA Puerto Chacabuco I. DE PASCUA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO CORRAL PTO. MONTT ANCUD 30º 40º PTO. CHACABUCO SAN PEDRO 50º PTA. ARENAS PTO. WILLIAMS Sea level Heights referred to CD Local Time SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 60ºS 105ºW 95º 85º 75º 65º 55º
Arica Rate of Changes of Sea Level ARICA IQUIQUE 20º Valparaíso I. DE PASCUA ANTOFAGASTA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO 30º CORRAL 40º PTO. MONTT ANCUD PTO. CHACABUCO SAN PEDRO 50º Ancud PTA. ARENAS PTO. WILLIAMS 60ºS SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 105ºW 95º 85º 75º 65º 55º
Rate of Changes of Sea Level San Félix Island Chilean Islands ARICA IQUIQUE 20º ANTOFAGASTA Eastern Island I. DE PASCUA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO 30º CORRAL 40º PTO. MONTT ANCUD PTO. CHACABUCO SAN PEDRO 50º PTA. ARENAS PTO. WILLIAMS 60ºS SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 105ºW 95º 85º 75º 65º 55º
Puerto Montt Rate of Changes of Sea Level Inland Waters ARICA IQUIQUE 20º ANTOFAGASTA Puerto Chacabuco I. DE PASCUA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO CORRAL PTO. MONTT ANCUD 30º 40º PTO. CHACABUCO SAN PEDRO 50º PTA. ARENAS PTO. WILLIAMS 60ºS SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 105ºW 95º 85º 75º 65º 55º
Heights and Rate of Changes of Sea Level Talcahuano I. DE PASCUA ARICA IQUIQUE ANTOFAGASTA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO CORRAL PTO. MONTT ANCUD PTO. CHACABUCO 20º 30º 40º SAN PEDRO 50º PTA. ARENAS PTO. WILLIAMS 60ºS SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 105ºW 95º 85º 75º 65º 55º
Heights and Rate of Changes of Sea Level Juan Fernández Island I. DE PASCUA ARICA IQUIQUE ANTOFAGASTA I. SAN FELIX CALDERA COQUIMBO VALPARAISO I. JUAN FERNANDEZ SAN ANTONIO TALCAHUANO CORRAL PTO. MONTT ANCUD PTO. CHACABUCO 20º 30º 40º SAN PEDRO 50º PTA. ARENAS PTO. WILLIAMS 60ºS SELF CONTAINED PLATFORM SATELITE DIGITAL PLATFORM PTO. SOBERANÍA RADA COVADONGA Territorio ChilenoAntártico 105ºW 95º 85º 75º 65º 55º
Rate of Changes Destroyed at 04:22 local time No Operative since 03:33 local time Destroyed at 05:28 local time
Typical Heights of Sea Level Destroyed at 04:22 local time No Operative since 03:33 local time Destroyed at 05:28 local time
GENERAL NOTES FOR DISCUSSION Rate of changes of Sea Level is an apropiate procedure for triggering warnings in the framework of tsunami alarms systems. The detection criteria should define a threshold, no matter by how much it is crossed. Max/Min Rate of changes coupled with expected max and min levels could keep false detections as infrequent as possible. False detections could be avoid if redundant sensors are available and the data are compared. One minute sea level sampling has been defined for tsunami monitoring. However small tsunamis generate waves with shorter period than the big ones, in these cases more frequently sampling could be necessary (15, 10, 5 or 1 sec.?) The sea level station should resist catastrophic tsunami waves. Strong mounting structures, datalogger protective cabinet installed as high as possible is required and submerged sensors fixed below CD, deep enough to provide sea level data during recession of the sea.
2 nd MEETING OF THE IHO TIDAL AND WATER LEVEL GROUP 27-29 APRIL 2010, STAVANGER, NORWAY THANKS