The Letter Series and the Golden Years of IH. The F-series tractors lasted until 1939. In late 1939, the famous Letter series of Farmall tractors was introduced. The model name letters were A, B, BN, C (which replaced the B and BN in 1948), H, M, and MD(M diesel).
Japan has had a long history of earthquakes and seismic activity. It is an area of high seismicity because it is located near major tectonic plate boundaries and is situated on the Pacific Ring of Fire.n July 16, 2007, an earthquake measuring 6.6 M, the 2007 ChÅ«etsu offshore earthquake hit about 29 kilometres (18 mi) west of Niigata in the northwest Niigata region of Japan. ) was a powerful magnitude 6.6 earthquake The earthquake shook Niigata and neighbouring prefectures.
How Japan's 2011 Earthquake Happened (Infographic). by Karl Tate, LiveScience Infographic Artist | March 10, 2013 03:35pm ET. The Tohoku earthquake fault is a complex mosaic, with patches that stick and patches that slide smoothly.Though the entire fault ruptured, or broke apart, during the earthquake, some parts moved in different ways.The deeper part of the fault shifted quickly, while the shallow part, very near the surface, slid slowly.hough the entire fault ruptured, or broke apart, during the earthquake, some parts moved in different ways. The deeper part of the fault shifted quickly, while the shallow part, very near the surface, slid slowly.