Tokyo stocks slumped today after deadly earthquakes brought factories in southern Japan to a grinding halt, while energy shares took a hit after weekend talks to freeze crude output failed.
Toyota and Sony were both sharply lower as their production lines on Japan's southwestern island of Kyushu remained offline in the wake of the powerful quakes that killed 42 people.
Tokyo's benchmark Nikkei 225 index dived 3.4%, falling for a second session in a row.
Energy companies suffered heavy selling after talks between major oil producing countries to cap output collapsed over the weekend, sending crude prices tumbling.
The glum news compounded the impact of last week's two earthquakes - the first on Thursday night, followed by a powerful 7 magnitude quake in the early hours of Saturday.
Toyota over the weekend announced the gradual suspension of assembly lines nationwide, citing problems with parts suppliers in the area.
Toyota plunged 4.75%, while Honda, which said its motorcycle plant in Kumamoto will also remain shut until Friday, tumbled 2.9%.
Analysts said the impact on car makers' bottom line should be relatively limited as they had built up backup procurement networks since a quake and tsunami disaster in 2011.
Sony, which has kept its image sensor manufacturing facility offline, finished 6.8% lower.
Kyushu Electric, which operates Japan's only two operating reactors, both on the island on which the quakes struck, dropped 7.95%, as the disaster aggravated safety concerns.
Meanwhile, Nissan has halted production at its Fukuoka plant which produces vehicles including the Serena, Teana, Murano and Note.
Renesas Electronics closed its plant in Kumamoto, which produces microcontroller chips for cars. It said it will not resume production until completing the assessment for potential damage.
Mitsubishi also halted production of its two plants in Kumamoto which produce parts including liquid crystal display modules. It has no timeline for resuming production.
And tyre maker Bridgestone halted production at its Kumamoto plant and said it will resume production once the situation is assessed.