Two very strong planetary alignments (Mars-Earth-Sun-Saturn), supported by (Mercury-Venus-Jupiter) fall during this time-frame with an added influence involving the Asteroid Ceres and astrological aspects involving Pluto indicate a potential for a 7.8 magnitude earthquake on either one of these forecasted days.
This is my own analysis using heliocentric imagery, geocentric portrait and harmonic translations to predict possible effects here on Earth. I am using astrological aspects in this forecast in-conjunction with lunar modulations.
Targeting a large Coronal Hole (CH566) in Northern Hemisphere of the solar corona: after further analysis I have isolated an area (16-24°N latitude) this Coronal Hole may itself be a foreshadow for a 7.8 magnitude earthquake in one of these listed locations during this watch period:
Forecast - (7.5 -7.8 Magnitude)
Time frame suggests: April 27-28, 2013
Results will be annotated at the end of this video.
Video and analysis: SolarWatcher
Featured image: Solar System Scope