Two confidential reports about Lapindo mudflow were uploaded to wikileaks. Here’s an excerpt from the wikileak page:

UK geologists downplayed Lapindo's argument and concluded that the earthquake was merely coincidental. While it could have generated a new fracture system and weakened strata surrounding the Banjar-Panji 1 well, it could not have been the cause of the formation of the hydraulic fracture that created the main vent 200 m (660 ft) away from the borehole. Additionally there was no other mud volcano reported on Java after the earthquake and the main drilling site is 300 km (190 mi) away from the earthquake's epicenter. The intensity of the earthquake at the drilling site was estimated to have been only magnitude 2 on Richter scale, the same effect as of a heavy truck passing over the area.

Read more.