A unique seven-, eight- or nine-digit number assigned to a noncitizen at the time his or her A-file is created. The 9-digit U.S. Citizenship and Immigration Services number listed on the front of Permanent Resident Cards (Form I-551) issued after May 10, 2010, is the same as the Alien Registration Number. The A-number can also be found on the back of these Permanent Resident Cards.
Strong tsunamis damage ports and harbors, as well as tourist areas, thereby damaging relief efforts and the economy of the communities. Authority: Dr. Hal Mofjeld, interview in February 25, 2005, NOAA Center for Tsunami Research; Where do tsunamis most often occur in the world? Tsunamis occur most often in the Pacific Ocean and Indonesia because the Pacific Rim bordering the Ocean has a large number of active submarine earthquake zones. However, tsunamis have also occurred recently in the Mediterranean Sea region and are expected in the Caribbean Sea as well.
February 27th, 2012 | Default |. Most tsunamis are caused by underwater earthquakes but not all underwater earthquakes cause tsunamis. In order for the underwater earthquake to cause a tsunami, the earthquake must rank at 6.75 or higher on the richter scale.The amount of smaller tsunamis that occur is unknown because the effects usually are not seen and/or felt.However when it comes to the larger tsunamis, there are only about six per century. 90% of which occur in the Pacific Ocean.Although recently the numbers have been going up, catastrophic tsunamis have been occurring one to two times within a decade.owever when it comes to the larger tsunamis, there are only about six per century. 90% of which occur in the Pacific Ocean. Although recently the numbers have been going up, catastrophic tsunamis have been occurring one to two times within a decade.