PADANG, Indonesia -- Many of the deaths from Asia's latest run of storms and earthquakes could have been prevented with measures such as better emergency planning and enforcement of building codes, disaster-management officials and architects say.

The official death toll in the 7.6-magnitude earthquake that struck Indonesia last week remained over 600, with more than 300 missing, for a second day Monday, with the death toll expected to climb as more bodies are found. Emergency teams wrapped up their efforts to locate victims...