What is the primary purpose of tsunami warning systems and what is a key limitation?

• A. To detect tsunamis and issue timely alerts to evacuate; limitations include detection delays and communication issues
• B. They forecast daily tides with high accuracy
• C. They monitor inland flood levels
• D. They provide long-term climate projections

Answer: (B)

The main idea behind tsunami warning systems is to detect when a tsunami is generated and then get timely alerts to people and authorities so they can evacuate before the wave arrives. They rely on networks of sensors—seafloor pressure meters, tide gauges, and seismic data—to spot a tsunami and estimate its travel time to shore. A key limitation is the time required to detect the event and communicate warnings. In near-field scenarios there may be only minutes to react, and in far-field cases delays can occur due to sensor gaps, data processing, or transmission issues. Because of these factors, warnings can sometimes arrive too late or be less reliable, highlighting why rapid detection and robust communication are essential. The option about forecasting daily tides or long-term climate projections isn’t the purpose of these systems, which are specifically about detecting tsunamis and alerting people to evacuate.