Viral Appearance of 'New Mountain' Bledug Kramesan in Grobogan After 6.5 Magnitude Earthquake in Tuban, Here's the Explanation from Geological Agency

Viral Appearance of 'New Mountain' Bledug Kramesan in Grobogan After 6.5 Magnitude Earthquake in Tuban, Here's the Explanation from Geological Agency.

Dream - The Geological Body of the Ministry of Energy and Mineral Resources explains the phenomenon of Bledug Kramesan or mud eruptions that form mountains in Medang Hamlet, Sendangrejo Village, Ngaringan District, Grobogan Regency, Central Java. The 'new mountain' is said to have existed for a long time and is found in several royal manuscripts in Java.

The phenomenon of Bledug Kramesan in the Grobogan area is not an extraordinary phenomenon. Moreover, not far from Bledug Kramesan, there is Bledug Kuwu which is generally known by the public as a mud volcano phenomenon that has been going on for decades,

According to Wafid, the Bledug Kramesan and Bledug Kuwu areas in the Paleogene age are included in the Pati Through, which allows for the rapid and thick deposition of sediment.

In terms of physiography, it is included in the Rembang Zone anticlinorium which consists of folded mountains in the form of an anticlinorium that extends from west to east, from Purwodadi City through Blora, Jatirogo, Tuban, to Madura Island. "The rocks deposited in this zone, after undergoing burial and compression, will form mud diapirs consisting of fine unconsolidated materials. Where these fine materials can escape to the surface through cracks and existing geological structures," said Wafid.

"The Factors Forming Mud Diapirs"

Some factors that influence the formation of mud diapirs are subsidence, sedimentation rate, plastic layers, overpressure and under-compacted, hydrocarbon potential, diagenetic water production, compression tectonics, and geothermal gradient.

"In terms of geological structure, bledug is located in an area that is not densely faulted and straightened due to its plastic nature. Therefore, in the mud area, there is no indication of fault straightening, but there is a geological structure in the form of an anticline with a relative Southwest-Northeast axis."

"tuturnya" in English is "he/she said."

Seismic subsurface beneath the area of mud eruption or mud volcano shows the presence of subsurface morphology of mud cone diapir, with its peak being close to the surface. In the mud diapir area, there are layers that are pulled upward by the pressure of the mud diapir. The thin mud cover layer in the eruption area causes high-pressure unconsolidated material and has a high water content that can easily escape to the surface.

The influence of earthquakes on mud diapirs and mud volcanoes allows for the opening of cracks that are traversed by mud materials. As a result, the mud diapir material will experience upward movement and there will be an increase in material discharge.

Activity of mud eruptions increased after the earthquake in Bawean on March 22, 2024 with a magnitude of 6.5 SR. It is suspected that this can cause the hydrocarbon and mud migration system to become more active due to openings in the form of cracks or faults caused by the shallow earthquake. As a result, mud in the Bledug Kuwu and Bledug Kramesan areas finds its way out through the cracks formed by the earthquake. The Geological Agency asks the community in the surrounding area not to panic and not to believe unclear news without scientific basis. The Geological Agency ensures that it will continue to monitor the development of this natural phenomenon.

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