M87 is one of the two main targets of the Event Horizon Telescope (EHT) project since it migth allow to detect the black hole shadow and promises a direct view on the jet launching process itself. In this talk, we present a re-analysis of 31 VLBA observations at 15 GHz (MOJAVE program). One of the findings is, that the M87-jet visible at 15 GHz, probes a different physical zone compared to the standard blazar-zone we tend to see in AGN jets. The most likely scenario explaining the observed phenomena is a turbulent mass loading into the jet, most probably due to local, fast reconnection processes driven by turbulence of a tangled magnetic field, either generated in the accretion disk or the disk corona. In addition, on large scales, a global magnetic structure is required to channel the turbulent flow into what evolves into a large-scale jet. Large-scale jet instabilities may explain the curved pattern of the observed jet flow. This scenario is supported by the Blandford & Payne-model although we cannot rule out a Blandford & Znajek-origin or -contribution.