The Pendleton Fault, sometimes called the Irwell Valley Fault, stretches for about from

Bolton Bolton (, locally ) is a large town in Greater Manchester in North West England, formerly a part of Lancashire. A former mill town, Bolton has been a production centre for textiles since Flemish people, Flemish weavers settled in the area i ...

in Greater Manchester along the

Irwell Valley The Irwell Valley in North West England extends from the Forest of Rossendale through the cities of Salford and Manchester. The River Irwell runs through the valley, along with the River Croal. Geology Shallow seas covered most of south-east ...

through Pendleton to

Poynton Poynton is a town in Cheshire, England, on the easternmost fringe of the Cheshire Plain, south-east of Manchester, north of Macclesfield and south of Stockport. Poynton has formed part of the Cheshire East unitary authority since the ab ...

in Cheshire, running northwest–southeast. The fault throws the beds of the Middle

Coal Measures In lithostratigraphy, the coal measures are the coal-bearing part of the Upper Carboniferous System. In the United Kingdom, the Coal Measures Group consists of the Upper Coal Measures Formation, the Middle Coal Measures Formation and the Lower Coal ...

of the

Manchester Coalfield The Manchester Coalfield is part of the South Lancashire Coalfield, the coal seams of which were laid down in the Carboniferous Period. Some easily accessible seams were worked on a small scale from the Middle Ages, and extensively from the begi ...

by on its western side. The fault is active, and movement has caused

earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

s. An earthquake of intensity 6 on the

Richter scale The Richter scale —also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale—is a measure of the strength of earthquakes, developed by Charles Francis Richter and presented in his landmark 1935 ...

that occurred on 10 February 1889 was felt over an area of . Lesser shocks were recorded in the early 20th century, in 1931 and 1944.

Coal mining Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from ...

in the Irwell Valley between Bolton and Pendleton may account for small movements, although all mines in the area closed in 1929 and no coal has been mined since. In 2007 a swarm of six earthquakes felt across the region was attributed to the fault.

References

Notes Bibliography * * {{refend Geology of England Geology of Cheshire Seismic faults of the United Kingdom