1957 Mongolia earthquake
... that the 1957 Mongolia earthquake produced the world's best-preserved surface rupture of any great earthquake?
... that the <b id="mwew"><a href="./1957_Mongolia_earthquake" id="mwfA" rel="mw:WikiLink" title="1957 Mongolia earthquake">1957 Mongolia earthquake</a></b> produced the world's best-preserved <a href="./Surface_rupture" id="mwfQ" rel="mw:WikiLink" title="Surface rupture">surface rupture</a> of any <a class="mw-redirect" href="./Richter_magnitude_scale#Richter_magnitudes" id="mwfg" rel="mw:WikiLink" title="Richter magnitude scale">great earthquake</a>?