1. Centre for Earthquake Studies, National Centre for Physics, P.O. Box Number 2141, Islamabad 44000, Pakistan, asim.khawaja@ncp.edu.pk
2. Also at International Centre for Theoretical Physics, Strada Costiera, 11, 1‐34151 Trieste, Italy.
3. GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany