But for previous major tsunamis, scientists just had measurements that tide gauges recorded near the coast or that surveyors later estimated from water damage on land. 但相對于過去的大海嘯，科學家只能得到驗潮儀在岸邊記錄到的測量值，或是勘測員事后依陸地毀壞程度所做的估測值。
The Observatory operates tide gauges for monitoring coastal flooding and raised sea levels caused by tropical cyclones. 天文臺并設有多副測潮器，監察由熱帶氣旋所引致沿岸地區泛濫，以及海平面上升的情況。
But for previous major tsunamis, scientists just had measurements that tide gauges recorded near the coast or that surveyors later estimated from water damage on land. 但相對于過去的大海嘯，科學家只能得到驗潮儀在岸邊記錄到的測量值，或是勘測員事后依陸地毀壞程度所做的估測值。
