Bitcoin keeps tumbling.

The price of the volatile digital currency briefly dipped below $10,000 around 7 a.m. ET on Wednesday, its lowest level since late November, according to data from CoinDesk.com.

Bitcoin has dropped nearly 30% this week and has lost almost half of its $19,343 peak value on December 16. Bitcoin approached its record as it launched on futures exchanges in the United States. But it has since fallen sharply.

Other popular cryptocurrencies ethereum and ripple also have posted double-digit losses. One virtual currency exchange, Bitconnect, dived 93% late Monday.

It's unclear why bitcoin has had a rough week. Cryptocurrency is a murky market with frequent swings.

"Volatility is quite common in the cryptocurrency world," said Mati Greenspan, a Tel Aviv-based analyst at investment firm eToro, on Tuesday.

The plunge follows a Bloomberg report on Monday that Chinese officials were stepping-up measures to limit cryptocurrency trading, which is already banned on exchanges.

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Investors in South Korea and Japan, the two largest cryptocurrency trading nations, were sitting on the sidelines Tuesday waiting for the regulatory uncertainty to clear before placing further bets, said Greenspan. He believes the light trading volume caused bitcoin's price to plunge.

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Trading is booming in South Korea, but officials began clamping down late last month.

South Korea banned opening anonymous virtual currency accounts and put in place new laws giving authorities power to shut down digital currency exchanges. Officials are currently weighing halting trading on exchanges.

--CNNMoney's Daniel Shane contributed to this story.