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In passive seismics, no controlled sources such as airguns, explo-ives, or vibrator trucks are used. Instead, passive sources are used uch as mini earthquakes within the subsurface of the earth for ex-mple, from reservoir rocks cracking due to fluid-pressure changes have assumed that this direct arrival is unknown. First, we will discuss the primary-multiple model for standard seismic acquisition and briefly review the EPSI method. Then we will show that the primary-multiple model can be easily extended to the situation of passive seismic data.After some modifications to the EPSI algorithm, it can reconstruct primaries from passive data. The methodology is illustrated for 2D synthetic data.stimation of primaries by sparse in. J. A. van Groenestijn1 and D. J. Verschuu For passive seismic data, surface multiples are used to ob-tain an estimate of the subsurface responses, usually by a crosscorrelation process. This crosscorrelation process relie