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<p>Extraction of <a href="page.php?w=petroleum">petroleum</a> likewise can cause significant subsidence. The city of <a href="page.php?w=Long_Beach%2C_California">Long Beach, California</a>, has experienced 9 m over the course of 34 years of petroleum extraction, resulting in damage of over $100 million to infrastructure in the area. The subsidence was brought to a halt when <a href="page.php?w=secondary_recovery">secondary recovery</a> wells pumped enough water into the oil reservoir to stabilize it.</p>

<p><big> Earthquake </big></p>
<p>Land subsidence</p><p>
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