Earthquake!

Of all places, one would never expect an earthquake to happen here in the UK. Afterall, if you look at this map here, UK is far away from any of the major fault lines, much further away than Singapore is from the Sumatran fault line that triggers the 2006 tsunami.

So it was a surprise when I felt the earthquake happened last night at around 12.55am. But I quickly remembered that there was once when nobody in Singapore ever believe we will be affected by earthquakes either. So never say never!

The earthquake felt like two very short bursts of vibration, separated by about 10 seconds. It is quite unlike the gentle swaying I felt in Singapore from my 17th floor flat from the tremours in Sumatra. In fact, I almost mistook it to be from the gusts of strong wind blowing at that time, if not for the fact that the vibration was coming from my cupboard, and not the window.

The earthquake has a magnitude of 5.2, and the epicentre is about 80km away from York. Because of the relative closeness of the epicentre, the vibration is stronger than what we experienced in Singapore, even though the magnitude is much smaller than the Sumatran earthquakes. I am staying on the 2nd floor (which is the 3rd storey, the British count floors starting from 0), and I can feel the shaking. In Singapore, earthquakes are mostly felt only above the 10th storey.

So if UK is so far away from any fault lines, what caused the earthquake? It seems that there is something call the Midlands Microcraton. This is an enormous block of rock running through Central England. The softer rocks on either side of the microcration are disturbed by the tectonic pressures that originate in the Atlantic Ocean, and this cause earthquakes when the pressures build up to a point where the rocks slipped. So, I supposed the mechanics of the earthquakes here are different from what we have in Singapore. It certainly felt different.

Well, according to the British Geological Survey, this type of earthquake happens only once in 30 years! So how lucky I am to feel it (must go buy 4-D!). But as I said earlier, never say never, who knows what other rare occurrences will I yet encounter?