This is from the BBC:

Kenyan geologists content that this latest episode was the result of heavy rains washing away underground volcanic ash:

According Gladys Kianji who is GSK chairperson, the phenomena in Mai Mahiu developed after volcanic ash under the ground was washed away. The geologist said that the area affected was between Mt Longonot and Mt Suswa which had volcanic activities years back thus creating tunnels underground.

“The current situation has nothing to do with the splitting of the continent as alleged as it’s the gushing waters that are sweeping away the volcanic ash underground thus creating the fault lines,” she said.

That said, Africa’s long-term geographical integrity doesn’t look good. It will take millions of years, but geologists expect the eastern African to split from the rest of the continent (see below).

The African Continent will certainly benefit from the increase in the length of its coastline. Suddenly eastern DRC and whole sections of Southern Sudan will not be super inaccessible anymore.