At least 200 people have now been confirmed dead in the New Year's Day earthquake that rocked Japan while around 100 others remain missing, authorities said Tuesday.

The 7.5 magnitude quake destroyed and toppled buildings, caused fires and knocked out infrastructure on the Noto Peninsula on Japan's main island Honshu just as families were celebrating New Year's Day.

Eight days later thousands of rescuers were battling blocked roads and poor weather to clear the wreckage as well as reach almost 3,500 people still stuck in isolated communities.

Ishikawa regional authorities released figures Tuesday showing that 202 people were confirmed dead, up from 180 earlier in the day, with 102 unaccounted for, down from 120.

On Monday, authorities had more than tripled the number of missing to 323 after central databases were updated, with most of the rise related to badly hit Wajima.

But since then "many families let us know that they were able to confirm the safety of the persons (on the list)," Ishikawa official Hayato Yachi told AFP.

With heavy snow in places complicating relief efforts, as of Monday, almost 30,000 people were living in around 400 government shelters, some of which were packed and struggling to provide adequate food, water and heating.

Almost 60,000 households were without running water and 15,600 had no electricity supply.

Road conditions have been worsened by days of rain that have contributed to an estimated 1,000 landslides.

At a daily disaster-relief government meeting Tuesday, Prime Minister Fumio Kishida instructed ministers to "make efforts of resolving the state of isolation (of communities) and continue tenacious rescue activities."

Kishida also urged secondary evacuations to other regions outside the quake-hit area, top government spokesman Yoshimasa Hayashi told reporters.

Japan experiences hundreds of earthquakes every year, though most cause no damage because of strict building codes in place for more than four decades.

But many structures are older, especially in rapidly aging communities in rural areas like Noto.

The country is haunted by the monster quake of 2011 that triggered a tsunami, left around 18,500 people dead or missing, and caused a nuclear catastrophe at the Fukushima plant.