Distant sources - A tsunami caused by a very large earthquake elsewhere on the Pacific Rim could reach the California coast many (4 to 15) hours after the earthquake. The Alaska-Aleutians Subduction Zone is an example of a distant source that has caused destructive tsunamis in California.
Norplant and Implanon. Norplant is the name given to a series of rods or capsules that a doctor surgically inserts into a womanâs upper arm. The inserts release progestin into a womanâs bloodstream in order to prevent the ovaries from releasing eggs. However, this mechanism only works some of the time.[1].
Depo-Provera works through the synthetic hormone (DMPA) which helps regulate a womanâs ovaries similar to the way the natural hormone progesterone works. Depo-Provera prevents pregnancy in one of three ways: 1  First, it prevents the ovaries from releasing an egg, which is also known as ovulation. 2  Second, it thickens the cervical mucus which acts as a barrier preventing the sperm from reaching the egg.