<div dir="ltr">I think mapping fault lines is already a challenge. While the fault line is a line on the ground, it really slopes underground.<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 23, 2021 at 12:53 PM Jim Morgan <<a href="mailto:jim@datalude.com">jim@datalude.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> From the consistently entertaining XKCD:<br>
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        <a href="https://xkcd.com/2519/" rel="noreferrer" target="_blank">https://xkcd.com/2519/</a><br>
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Jim<br>
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