It has been noted that the traditional wooden houses are generally more earthquake-resistant than modern brick designs, although they are more vulnerable to fire. The construction of modern concrete framed and brick walled "rumah adat" has undermine the very characteristic of traditional wooden house, which is its flexibility to absorb shock-waves generated by an earthquake. These concrete "rumah adat"-style building often can not withstand earthquake and collapsed, like those buildings collapsed in 2009 Padang earthquake. In some areas, a 'semi-modern' "rumah adat" concept has been adopted, such as among some Ngada people, with traditional elements placed inside a concrete shell.