He said getting clean water and emergency sanitation to the area were the number one priority.
Then the difficult task of rebuilding the lives of the villagers - including the many children who have lost family in the tragedy - will begin.
He said: "Our first priority was to get water supplies going - people had just a few bottles of water handed out yesterday by visitors, the local government.
"At the same time we are urgently looking at sanitation.
"Then we have to help children to overcome this traumatic event. We have got to get them back to school as soon as we can. That is part of the return to normalcy."
an Afghan woman cries after her family were killed in the landslide
The tragedy is "disastrous" for children, many of whom have been left fatherless by the landslide, Mr Morris warned.
Fathers were the sole breadwinner for many families in the already desperately poor area. Their deaths raises the propsect that villagers could slip into further poverty, malnutrition and death, he warned.
Mr Morris said: "In that province they are desperately poor, so this added shock can flip someone who is poor into a situation where they can barely survive.
"And then two or three months down the line we will see that the youngest children are not gaining weight, they become malnourished. And that puts them in the cycle of malnutrition disease, and unfortunately death.
"For communities affected by this, it is not just the immediate response - we have got to be looking at the follow up."
British charities were among the groups handing out the much-needed aid.
Onno Van Manen, acting country director for Save the Children in Afghanistan, said the newly merged charity had sent aid workers to the stricken area.
He said: "They have dispatched five ambulances, set up mobile health clinics, and have medical staff on stand-by to support the injured in this disaster."
While Oxfam's Afghanistan country director John Watt said the organisation is "readying a response".
