2) Based on the analysis of the earthquake response records of the main shock, the acceleration response spectra were large enough to reach approximately three times the damage limit acceleration spectrum in the range of 0.2–0.3 Hz, which is approximately the natural frequency of the building. In addition, from the maximum angles (1/164 and 1/190 for the TR and LG directions, respectively) and the change in the first-order natural frequency in the initial and end edge intervals, the building seemed to be heavily damaged by the main shock. The horizontal stiffness sharply dropped, and the damage in the LG direction was slightly larger than the damage in the TR direction