Thanks to Pete Hill at PAUL for spotting this one. The magnitude of the event on Taiwan on 23rd April was reported as either 5.8 or 6.0, generally too small to detect. However on stations PAUL and KEYW you can clearly see the Surface wave arrivals booming through (at KEYW I calculated Ms=6.6 based on the 20sec surface wave amplitude). Why such big surface waves ? Well it was a very shallow event (10km) , the focal mechanism (mostly strike-slip) generated a lot of horizontal shear energy, the propogation path across Asia has low attentuation and it was a quiet day in the UK. However it is still impressive to detect data from a Mw=5.8 event 89 degrees away (thats nearly 10,000km)!