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We analyze the statistics of pulse arrival times in fast radio burst (FRB)121102 and demonstrate that they are remarkably similar to statistics ofmagnetar high-energy short bursts. Motivated by this correspondence, we proposethat repeating FRBs are generated during short bursts in the closed field linezone of magnetar magnetospheres via a pulsar-like emission mechanism. Crustalslippage events dislocate field line foot points, initiating intense particleacceleration and pair production, giving rise to coherent radio emissionsimilar to that generated near pulsar polar caps. We argue that the energeticsof FRB 121102 can be readily accounted for if the efficiency of the conversionof Poynting flux into coherent radio emission is $\sim10^{-4}-10^{-2}$, valuesconsistent with empirical efficiencies of radio emission in pulsars andradio-loud magnetars. Such a mechanism could operate only in magnetars withpreexisting low twist of the magnetosphere, so that the charge density in theclosed zone is initially insufficient to screen the electric field provoked bythe wiggling of magnetic field lines and is low enough to let $\sim 1$ GHzradio emission escape the magnetosphere, which can explain the absence of FRBsfrom known magnetars. The pair cascades crowd the closed flux tubes withplasma, screening the accelerating electric field, thus limiting the radiopulse duration to $\sim1$ ms. Within the framework of our model, the currentdataset of the polarization angle variation in FRB 121102 suggests a magneticobliquity $\alpha\lesssim40^\circ$ and viewing angle $\zeta$ with respect tothe spin axis $\alpha<\zeta<180^\circ-\alpha$.

Repeating Fast Radio Bursts from Magnetars with Low Magnetospheric Twist