UPDATE 6-Japan rescuers search quake rubble for survivors as manufacturers count cost
* Dozens believed trapped in rubble after quake
* Cost of damage could run to several billion dollars
* No irregularities reported at nuclear plants
* Sony, Toyota, Honda operations affected (Adds more than 470 quakes on Japanese island since Thursday; quote from chief cabinet secretary; details of Ecuador quake)
By Kaori Kaneko and Thomas Wilson
TOKYO, April 17 (Reuters) - Japanese rescue teams on Sunday scoured the splintered remains of buildings destroyed by a series of deadly earthquakes in southern Japan as time ran out for finding survivors and as major Japanese manufacturers face production losses from supply chain disruptions.
A 7.3 magnitude tremor struck early on Saturday, killing at least 32 people, injuring about a thousand and causing widespread damage to houses, roads and bridges, with at least one mountain highway severed in two, concrete tumbling into the valley below.
In the village of Minamiaso, 11 people were "out of contact", said public broadcaster NHK. Rescuers pulled 10 students out of a collapsed university apartment in the same settlement on Saturday.
"In Minamiaso, where the damage is concentrated, there may still be people trapped under collapsed buildings, so we are focusing our attention and rescue and search efforts in this area," Chief Cabinet Secretary Yoshihide Suga told reporters. Continuación...