GOES satellites<\/a> and relied on automatic tsunami detection, DART II (operational since 2005) features two-way communication via the Iridium satellite system. This allows TWCs to manually trigger event mode for high-resolution data (15-second intervals) or retrieve data for analysis, reducing false positives and enabling detection of smaller tsunamis.<\/p>\n\n\n\nMonitoring Modes:<\/h2>\n\n\n\n
Standard Mode: Records sea-level height every 15 minutes, transmitting data hourly (four observations).
Event Mode: Triggered automatically by a pressure change (e.g., 3 cm) or manually by TWCs, it sends 15-second data for up to three hours, providing detailed tsunami wave information.<\/p>\n\n\n\n
Development and Deployment
History:<\/h2>\n\n\n\n
Developed by NOAA\u2019s Pacific Marine Environmental Laboratory (PMEL), the first DART prototype was deployed in 1995 off Oregon. DART I became operational in 2003, and DART II upgrades began in 2005, with all stations converted by 2008.
The 2004 Indian Ocean tsunami spurred global expansion, leading to 39 U.S.-operated DART II stations by 2008 across the Pacific, Atlantic, and Caribbean, with additional stations deployed by countries like Australia, Chile, Indonesia, and Thailand.<\/p>\n\n\n\n
Global Impact:<\/h2>\n\n\n\n
DART II data is shared internationally via the Global Telecommunications System (GTS) and archived by NOAA\u2019s National Centers for Environmental Information (NCEI). It supports tsunami forecasting models like the Method of Splitting Tsunamis (MOST), improving wave height and arrival time predictions.
<\/p>\n\n\n\n
Functionality<\/h2>\n\n\n\n
Tsunami Detection: The BPR detects pressure changes from tsunami waves, which are distinct from faster-moving earthquake waves. When a tsunami is detected, the system switches to event mode, sending rapid updates to TWCs in places like Hawaii, Alaska, or New Zealand\u2019s National Geohazards Monitoring Centre (NGMC).
Forecasting: Data is integrated with seismic information and pre-computed models to refine tsunami source estimates, predicting coastal impacts. For example, in New Zealand, DART stations can provide 2.5-3 hours of warning for distant tsunamis.
Applications: Used by NOAA\u2019s Tsunami Warning Centers, the Pacific Tsunami Warning Centre (PTWC), and international systems like India\u2019s INCOIS, DART II enhances warning accuracy, reducing false alarms and enabling timely evacuations.<\/p>\n\n\n\n
Challenges and Reliability<\/h2>\n\n\n\n
Maintenance: DART II systems face harsh ocean conditions, leading to reliability issues. A 2010 report noted that only 60% of 39 U.S. stations were operational by 2009 due to rapid deployment and insufficient testing. Maintenance costs are high (around $300,000 per buoy annually), and budget cuts have slowed improvements.
Improvements: The system\u2019s design allows remote configuration and uses acoustic release mechanisms for easier recovery. Dual modems and redundant communication systems enhance reliability.
<\/p>\n\n\n\n
Impact and Significance<\/h2>\n\n\n\n
DART II has revolutionized tsunami forecasting by providing real-time, deep-ocean data, enabling more accurate and timely warnings compared to earlier earthquake-centric systems. For instance, it helped avoid unnecessary evacuations during a small Alaskan tsunami in 2004.
The system is critical for regions like the Pacific, where 76% of fatal tsunamis occur, and supports global efforts through UNESCO-IOC and national agencies like New Zealand\u2019s NEMA.<\/p>\n","protected":false},"excerpt":{"rendered":"
DART II Deep Ocean Assessment and Reporting of 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