"The sea water surged, ranging from six centimeters of the tide gauge in Mamuju at 5.27pm Western Indonesia Standard Time (WIB) and eye witnesses on the field saw the height of the tsunami reached 1.5 meters," the BMKG head told a press conference here on Friday.
The BMKG, which previously announced the magnitude of the earthquake at 7.7 on the Richter scale, updated the magnitude to 7.4 on the Richter scale, which occurred at 0.20 degrees southern latitude and 119 degrees eastern longitude at a depth of 11 kilometers.
Based on the agency`s standard, the earthquake could generate a tsunami at an alert level of over 50 centimeters to 3 meters, which could arrive onshore at 5.22pm (WIB).
The results of the BMKG monitoring showed that the water had continued to recede so that the tsunami warning ended at 5.36pm (WIB).
"This means that the 1.5-meter tsunami indeed took place but the incident ended at 5.36pm WIB, and thus, the BMKG ended the tsunami early warning," Karnawati said.
BMKG monitoring results showed that until 8pm WIB, 22 aftershocks followed with the smallest magnitude of 2.9 on the Richter scale and the strongest one at 6.3 on the Richter scale.
Reporting by Desi Purnamawati