We present initial rock magnetic results for both lava flows and lapilli produced by the 2021
eruption of the Cumbre Vieja, La Palma (Canary Islands). Samples were taken during the eruption to
minimize early alteration and weathering of the rocks and tephra. Standard procedures included
progressive alternating field and thermal demagnetization, hysteresis curves, thermomagnetic experiments, progressive acquisition of isothermal remanent magnetization (IRM), and First-Order Reversal
Curves (FORCs). Overall, our observations, including low to medium unblocking temperatures,
isothermal remanent magnetization to 1 Tesla, and the abundance of wasp-waist hysteresis loops,
strongly suggest the presence of Ti-rich titanomagnetites as the main remanence carriers in both lava
flows and lapilli, in addition to some hematite as well. Whereas the former has been directly seen
(SEM), hematite is elusive with nonmagnetic-based methods. Rock magnetic data, on a Day plot, also
reveal that the magnetic grain size tends to be larger in the lava flows than in the lapilli.
