1970 Tonghai earthquake
... that a large earthquake monitoring network was established in China's Yunnan Province 25 years after the 1970 Tonghai earthquake ?
... that a large earthquake monitoring network was established in <a class="mw-redirect" href="./People's_Republic_of_China" id="mwDxc" rel="mw:WikiLink" title="People's Republic of China">China</a><span id="mwDxg" typeof="mw:Nowiki">'s</span> <a class="mw-redirect" href="./Yunnan_Province" id="mwDxk" rel="mw:WikiLink" title="Yunnan Province">Yunnan Province</a> 25  years after the <b id="mwDxo"><a href="./1970_Tonghai_earthquake" id="mwDxs" rel="mw:WikiLink" title="1970 Tonghai earthquake">1970 Tonghai earthquake</a></b> <i id="mwDxw">(location pictured)</i>?