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EARTHQUAKE.
"When the earth is shaken with its (final) earthquake. And when the earth throws out its burdens. And man will say: "What is the matter with it?" That Day it will declare its information (about all that happened over it of good or evil). Because your Lord will inspire it. That Day mankind will proceed in scattered groups that they may be shown their deeds. So whosoever does good equal to the weight of anatom (or a small ant) shall see it. And whosoever does evil equal to the weight of an atom (or a small ant) shall see it."(Surat Az-Zalzalah (The Earthquake):1-8 )
When four sins become common, then four things appear: when zina becomes common(people do not hide it and are not ashamed of it) then earthquakes appear. When people stop paying zakat then cattle start to die. When rulers/ judges are injust then rain stops to come down. When people are unfaithful then disbelievers become victorious over the Muslims.(hadith)

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