本文將介紹台灣及美國幾個重要地震網站，並點出921大地震前後資訊的差異，以供讀者參考。文中將網站分為台灣及美國兩大部份，其下再分成政府機構、學術單位、學會、與個人網站依序介紹。
A large and damaging earthquake occurred in Taiwan on September 21, 1999 (01:47AM). Preliminary location is in Nantou County. The epicenter was near the small country town of Chichi, so be named as Chichi Earthquake. This powerful earthquake rocked Taiwan dawn, killing at least 2100 people, and with 8000 people injured, toppling buildings and trapping hundreds in the wreckage. In this period, the Earthquake's homepage around Taiwan and U.S.A. are very different. This article attempts to clarify the gap and study what's going on.
