A magnitude 6.3 earthquake occurred in Yogyakarta at ~ 06:00 local time 27 May 2006 , approximately 250 kilometres Southwest of Sidoarjo . It has been suggested that a small ( 20 barrel ) mud loss occurred in the Banjar Panji-1 well seven minutes after the Yogyakarta earthquake ( consistent with the time taken for the earthquake seismic waves to reach the Lusi location ) , though there is no clear report of these losses in the drilling data , and it has also been alternatively reported that these losses occurred one hour before the earthquake . The well suffered a complete loss of circulation at 12:50 p.m. local time on the 26th May 2006 , which was between 1.5-4.75 hours after three large aftershocks . A loss of circulation happens when drilling mud — necessary for maintenance of wellbore stability — that is pumped down a shaft does not return to the surface but is lost into some opening or a fault system . This mud loss problem was finally stopped when '' ' loss circulation material ' '' was pumped into the well , a standard practice in drilling an oil and gas well . A day later the well suffered a ‘ kick ’ , an influx of formation fluid into the well bore . The kick was reported by Lapindo Brantas drilling engineers as having been killed within three hours , though alternative interpretations of drilling records , specifically ongoing fluctuations in downhole drillpipe pressure , indicate that the kick continued for at least 24 hours . Early the next day , on 29 May 2006 , steam , water and mud began erupting up to 200 meters above the well , a phenomenon that is now known as the Lusi mud volcano . Dense drilling mud and cement were pumped down the Banjar Panji-1 well at various times in the 48 hours after the mud flow started , in an attempt to kill the surface mud eruption . Lapindo Brantas daily drilling records state that " bubbles intensity reduced and elapse time between each bubble is longer " after pumping dense drilling mud down the well , indicating direct communication between Banjar Panji-1 and the Sidoarjo mudflow . A detailed review of the timing of key events in the drilling of Banjar Panji-1 and the first days of the Sidoarjo mudflow can be found in reference
magnitude 6.3 earthquake occurred in Yogyakarta
2006 Yogyakarta earthquake
Sidoarjo mud flow