Precursor SPC | 498 followers on LinkedIn. Space Weather and Earthquake Nowcasting | precursor forecasts earthquakes. With the foreknowledge of changing seismic risk and developing seismic events, earthquakes, precursor delivers preparedness through its Data Services. We now have the time to prepare, make decisions and take action to safeguard people, business and the economy from the costliest and deadliest reoccurring natural disaster, earthquakes.