The Quarterly journal of the Geological Society of London . Rochdale Manchester Sheffield Lincoln 0 1 Newark Quart. Journ. Geol. Soc. Vol. LXIII, PI. Map illustrating the Area affected by the Swansea Earthquake of JUNE 26™ 1906. Vol. 63.] SWANSEA EARTHQUAKE OF 1906. 361 There is no known fault in the position assigned by the seismicevidence. The great east-and- west fault under Swansea Ba3, thoughnearly in the required direction, passes about 5 or 6 miles to thesouth of the line indicated, and cannot, I think, be connected withthe earthquake. This aud the other parallel faults of
The Quarterly journal of the Geological Society of London . Rochdale Manchester Sheffield Lincoln 0 1 Newark Quart. Journ. Geol. Soc. Vol. LXIII, PI. Map illustrating the Area affected by the Swansea Earthquake of JUNE 26™ 1906. Vol. 63.] SWANSEA EARTHQUAKE OF 1906. 361 There is no known fault in the position assigned by the seismicevidence. The great east-and- west fault under Swansea Ba3, thoughnearly in the required direction, passes about 5 or 6 miles to thesouth of the line indicated, and cannot, I think, be connected withthe earthquake. This aud the other parallel faults of the districtare chiefly, if not entirely, of pre-Triassic age. Small displacementshave, however, taken place in post-Triassic times, and it is probablethat the Swansea earthquake was due to a movement along a faultwhich has not yet affected the structure of the superficial How slowly the fault is growing is indicated by the rarity oftrue tectonic earthquakes. For more than 70 years, no slip of anyconsequence has taken place along any one of the system of may have been a few creeps along the fault-surface duringthe 24 hours preceding t
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