Estimate the strains by running an EQL site response.

        This step was recommended in Section 8.3.1 of Zalachoris (2014).

def _estimate_strains(self):
        """Estimate the strains by running an EQL site response.

        This step was recommended in Section 8.3.1 of Zalachoris (2014).
        """
        eql = EquivalentLinearCalculator()
        eql(self._motion, self._profile, self._loc_input)