Quake, with an epicentre 22 km from Sukabumi city, had no potential to trigger a tsunami and struck at a depth of 104 km, says the country's geophysics agency BMKG.
Several villages were blanketed with falling ash, blocking out the sun, but no casualties have been reported.
Local authorities said there appeared to be no significant damage.
Students rallied outside parliament in capital Jakarta, protesting against rising fuel and food costs and the prospect of President Joko Widodo outstaying his two-term limit.
Bus carrying high school students and their parents in West Java's Sumedang district plunges into ravine, killing 27 people and injuring 39 others, officials say.
More than 28,000 residents in four villages in Bekasi district and 34 villages in Karawang district are affected by the floods, spokesperson for the National Disaster Mitigation Agency said.
The sweeping new legislation has been championed by the government of President Joko Widodo as key to boosting the competitiveness of Southeast Asia's largest economy but protesters fear the law will cripple labour rights and harm the environment.
Indonesia's various music styles could be the deciding factor for winning some hearts – and votes – for Indonesians as they head to the polls next week.
Officials say 34 people remain missing after a landslide triggered by torrential rain hit village of Sirnaresmi in West Java's Sukabumi district.
Magnitude 6.5 earthquake shook Indonesia's most populous island of Java and triggered a tsunami warning that was lifted about two hours later.
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