A magnitude 6 main shock struck on October 1, and was followed by a magnitude 4.9 aftershock two hours later. These shocks caused 92 deaths and injured more than 200 people in Dinar, a city with a population of 35,000. A total of 201 buildings collapsed, and about 1000 buildings were damaged to varying levels. The Turkish government undertook an extensive retrofit program after this disaster. One third of all dwellings were sufficiently damaged to require repairs.
Seismologists consider it a strong, delayed aftershock.
Therefore, the 1998 earthquake may be regarded as a mild, in-situ testing of the retrofitted structures. Events 1-4 date from 1995, and event 5 is the 1998 earthquake. The NS and EW components of the five sets of ground accelerations are shown in Figure 2 in the same order as in Table 1. Basic features of the five events and their associated ground motion parameters are presented in the same table. This is not surprising since seismic waves from events 1,2 and 5 traveled through the same source-receiver paths, as did the waves from events 3 and 4.