1947 earthquake
... that a 1947 earthquake in the U.S. state of Wisconsin was strong enough to break a seismograph at Marquette University?
... that a <b id="mwEPs"><a href="./1947_Wisconsin_earthquake" id="mwEPw" rel="mw:WikiLink" title="1947 Wisconsin earthquake">1947 earthquake</a></b> in the <a href="./U.S._state" id="mwEP0" rel="mw:WikiLink" title="U.S. state">U.S. state</a> of <a href="./Wisconsin" id="mwEP4" rel="mw:WikiLink" title="Wisconsin">Wisconsin</a> was strong enough to break a <a class="mw-redirect" href="./Seismograph" id="mwEP8" rel="mw:WikiLink" title="Seismograph">seismograph</a> at <a href="./Marquette_University" id="mwEQA" rel="mw:WikiLink" title="Marquette University">Marquette University</a>?