(Reuters) - Here is a chronology of key events on Friday after an 8.9 magnitude earthquake shook skyscrapers in Tokyo, the Japanese capital, and devastated northeastern coastal regions:
Maruzen shuts two naphtha crackers at Chiba with capacities of 480,000 and 690,000 tonnes of ethylene per year, respectively.
Residents near Japan's Fukushima Daiichi nuclear plant told to evacuate, Jiji says. No damage expected from reactor cooling problem.
Kyokuto Petroleum says shuts 175,000 bpd Chiba refinery after quake, will not reopen until tomorrow at earliest.
No fire in LNG, oil tanks in Japan's Sendai city, the city fire department says.
Cosmo Oil says fire at Chiba refinery started from near LPG tank, not yet extinguished.
Mitsui Mining says operation at Hachinohe Zinc smelter halted due to quake, all employees evacuated.
U.N. nuclear watchdog in Vienna says four nuclear power plants closest to Japan quake safely shut down.
Fire at Japan's Tohoku Elec's Onagawa nuclear plant after quake, news agency Kyodo says.
Sumitomo Metal Industries says temporarily suspends operations at two blast furnaces at Kajima plant.
JX Holdings says it is working to shut 404,000-tpy Kawasaki naphtha cracker near Tokyo after quake.
Japanese government to declare nuclear power emergency situation, news agency Jiji says, citing defense ministry.
Tonengeneral says shuts main units at Kawasaki refinery near Tokyo after quake.
Tokyo Commodity Exchange says no damage to rubber warehouses from the quake.
Tsunami is one of the biggest on record for Japan, says Kyodo, quoting expert.
All Japanese ports close, with discharge operations halted, after the magnitude 8.9 quake and tsunami, shippers say.
Mitsubishi Material says Onahama copper smelter halted due to electricity outage from quake.
Asian jet fuel bids seen at lower level as closure of Japanese airports may dampen demand, traders say.
Asian fuel oil April/May and May/June timespreads traded up around $1 from the previous session, brokers say.
Cosmo Oil says Chiba refinery fire from storage tank, still working to extinguish it.
Northeast Japan's Sendai airport flooded, television says.
Mitsubishi Chemical says halts operations of 2 naphtha crackers at Kashima after power outage. Japanese Prime Minister Naoto Kan says some Japanese nuclear power plants shut down but no report of nuclear leaks.
Japan extends warning for big tsunami to more areas on Pacific coast, Kyodo says.
Tsunami of 10 metres hits port in Sendai, northern Japan, Kyodo says.
Major fire breaks out at Cosmo Oil's Chiba refinery near Tokyo, television reports.
Tokyo Electric Power says power cut to 4 million homes.
Power outage hits 4 million homes in Tokyo, surrounding area, Kyodo says.
Tokyo gold futures pare losses after quake rocks Japan, TOCOM rubber largely unmoved.
Tokyo Commodity Exchange says trading normally after quake.
Japan's Shinkansen bullet trains to northern parts of the country halted, Kyodo says.
Earthquake shakes buildings in Tokyo, witnesses say.
Page Editor: Clarence Fernandez, Asia Desk