A <a href="https://en.wikipedia.org/wiki/1986_Kalamata_earthquake" id="mwATA" rel="mw:WikiLink" title="1986 Kalamata earthquake">magnitude 6.0 earthquake</a> strikes Kalamata, Greece with a maximum <a href="https://en.wikipedia.org/wiki/Modified_Mercalli_intensity_scale" id="mwATE" rel="mw:WikiLink" title="Modified Mercalli intensity scale">Modified Mercalli intensity</a> of X (<i id="mwATI">Extreme</i>), killing at least 20 and causing heavy damage in the city.<sup about="#mwt37" class="mw-ref reference" data-mw='{"name":"ref","attrs":{"name":"USGS"},"body":{"id":"mw-reference-text-cite_note-USGS-6"}}' id="cite_ref-USGS_6-0" rel="dc:references" typeof="mw:Extension/ref"><a href="./September_13#cite_note-USGS-6" id="mwATM" style="counter-reset: mw-Ref 6;"><span class="mw-reflink-text" id="mwATQ">[6]</span></a></sup>