the Moon. February 6 – The 4.6 Mb Tuscania earthquake shakes the Italian province of Viterbo with a maximum Mercalli intensity of VIII (Severe), causing 24 deaths, 150 injuries and extreme damage. February 7 Switzerland gives women voting rights in state elections, but not in all canton-specific ones. Władysław Gomułka is expelled from the Central Council of the Polish Communist Party. February 8 – A new stock market index called the Nasdaq Composite debuts in the United States. February 9 The 6.5–6.7 Sylmar earthquake hits the Greater Los Angeles Area with a maximum Mercalli intensity of XI (Extreme), killing 64 and injuring 2,000. Satchel Paige becomes the first Negro league player to become voted into the Baseball Hall of Fame. Apollo program: Apollo 14 returns to Earth after the third human Moon landing. February 10 – A total lunar eclipse is visible from Pacific, Americas, Europe and Africa, and is the 50th lunar eclipse of Lunar Saros 123. February 11 – The US, UK, USSR and others sign the Seabed Treaty, outlawing nuclear weapons on the ocean floor. February 11 – 12 – Palestinian and Jordanian fighters clash in Amman. February 13 – Vietnam War: Backed by American air and artillery support, South Vietnamese troops invade Laos. February 15 – Decimal Day: The United Kingdom and Ireland both switch to decimal currency (see also decimalisation). February 16 – In Italy, a local parliament elects the city of Catanzaro as the capital of Calabria; residents of Reggio di Calabria riot for 5 days because of the decision. February 20 – The U.S. Emergency Broadcast System sends an erroneous warning across the nation's radio and television stations, meant to be a standard weekly test conducted by NORAD in Cheyenne Mountain in Colorado. Some stations cease broadcasting until the message is rescinded, as required by federal rules, while most ignore it. February 21 The Convention on Psychotropic Substances is signed at Vienna. Between February 21 and 22, an outbreak of nineteen tornadoes rage across the Mississippi Delta in Mississippi and Louisiana, killing 123 people. February 23 – Operation Lam Son 719: South Vietnamese General Do Cao Tri is killed in a helicopter crash en route to taking control of the faltering campaign. February 25 – A partial solar eclipse is visible from Europe, Africa and Asia, and is the 18th solar eclipse of Solar Saros 149. February 26 – Secretary General U Thant