more than a dozen australians are reported missing following the quake .
julie bishop confirmed there are no reports of australian deaths .
the australian government has committed $ 5 million in aid to help nepal .
families have launched a desperate search for information on social media .
australian actor hugh sheridan has made a desperate plea for his brother .
zachary sheridan is missing after a huge earthquake rocked the country .
the powerful quake has caused massive damage in the capital kathmandu .
officials have confirmed about 100 new zealanders in nepal are safe .
more than 1800 were killed and warned the death toll likely to rise .