Table 1: Observation sites with station number, corresponding time periods estimated, and location.

Site nameStation numberOperation periodLocation

Zhengzhou57083195101–20071234° 43′N113° 39′E
Anyang53898195102–20071236° 07′N114° 22′E
Zhumadian57290195801–20071233° 00′N114° 01′E
Xinyang57297195101–20071232° 08′N114° 03′E
Lushi57067195207–20071234° 03′N 111° 02′E

Longitude and latitude of the location is represented as degree and minute.