Very-Short-Term Variations of Sea Surface and Atmospheric Parameters Before the Ms 6.2 Zhangbei (China) Earthquake in 1998

The Ms 6.2 Zhangbei earthquake occurred at 3:53 (UTC) on 10 January 1998, with its epicenter located about 150 km northwest of Beijing, China. Over the past 2 decades, many studies have reported that there was a positive thermal infrared (TIR) anomaly appearing along direction from Bohai Sea to within 2–3 days preceding earthquake, which considered be caused by activity great Zhangbei-Bohai fault (ZBF) extending across southeast, while neither TIR is convinced nor mechanism clear. A collaborative analysis atmospheric disturbances several before, during, and after conducted using satellite observations reanalysis datasets multiple parameters, including sea surface roughness, evaporation rate, CO concentration, salt cloud base height above surface, as well images. Through individual change each parameter synergic particular disturbances, formation strip-shaped clouds 7 9, were revealed over ZBF another named Tancheng-Lujiang (TLF), extends northeast. After careful investigation attribution spatio-temporal evolutions every hour around 12, we came conclusion low-level seismic submarine gas release TLF but not forced wind field lowering boundary layer. As an aftereffect localized higher brightness temperature than land anomaly, thus, appeared chance ZBF, earthquake.