R.W. Jibson E. L. Harp 1996 <div id="136982821" class="article-section-wrapper js-article-section js-content-section " data-section-parent-id="0"><p>The 17 January 1994 Northridge, California, earthquake (<i>M_w</i><span>&nbsp;</span>= 6.7) triggered more than 11,000 landslides over an area of about 10,000 km². Most of the landslides were concentrated in a 1000-km²<span>&nbsp;</span>area that included the Santa Susana Mountains and the mountains north of the Santa Clara River valley. We mapped landslides triggered by the earthquake in the field and from 1:60,000-nominal-scale aerial photography provided by the U.S. Air Force and taken the morning of the earthquake; these mapped landslides were subsequently digitized and plotted in a GIS-based format. Most of the triggered landslides were shallow (1- to 5-m thick), highly disrupted falls and slides within weakly cemented Tertiary to Pleistocene clastic sediment. Average volumes of these types of landslides were less than 1000 m³, but many had volumes exceeding 100,000 m³. The larger disrupted slides commonly had runout paths of more than 50 m, and a few traveled as far as 200 m from the bases of steep parent slopes. Deeper (&gt;5-m thick) rotational slumps and block slides numbered in the tens to perhaps hundreds, a few of which exceeded 100,000 m³<span>&nbsp;</span>in volume. Most of these were reactivations of previously existing landslides. The largest single landslide triggered by the earthquake was a rotational slump/block slide having a volume of 8 × 10⁶<span>&nbsp;</span>m³. Analysis of the mapped landslide distribution with respect to variations in (1) landslide susceptibility and (2) strong shaking recorded by hundreds of instruments will form the basis of a seismic landslide hazard analysis of the Los Angeles area.</p></div> application/pdf 10.1785/BSSA08601BS319 en Seismological Society of America Landslides triggered by the 1994 Northridge, California, earthquake article