By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks finished the week with deep losses as investors fled equities and emerging-markets currencies on concerns about a contagion effect from China's manufacturing slowdown.

The S&P 500 and the Dow Jones Industrial Average recorded their worst weekly losses in more than a year while volumes on Wall Street on Thursday and Friday were significantly higher than their 30-day averages.

The S&P 500 (SPX) closed below the psychologically significant level of 1,800 for the first time since Dec. 17, dropping 38.17 points, or 2.1%, to 1,790.29. The benchmark index shed 2.6% over the past week, its worst weekly percentage loss since June 2012. The index is now 3.1% below its record high, reached Jan. 15. The trading week was shortened by Monday's Martin Luther King Jr. Day holiday.

The Dow Jones Industrial Average (DJI) dropped 318.24 points, or 2%, to 15,879.11 and lost 3.5% over the week, its worst weekly percentage decline since 2011. The last time the blue chip index had two consecutive days of triple digit losses were in Dec 11. and Dec 12.

The Nasdaq Composite (RIXF) lost 90.70 points, or 2.2%, to 4,128.17 and registered a weekly loss of 1.7% after two weeks of gains. On Friday, the tech-heavy index reversed its early 2014 gains and is now down 1.2% since the start of the year. Read the recap of the U.S. markets on the live blog

The CBOE Volatility Index (VIX) , known as the Vix, surged 32%, its steepest rise since the April 15 Boston Marathon bombings.

Investors began selling stocks and emerging-markets currencies heavily on Thursday following weak Chinese economic data. The sharp selloffs on Wall Street prompted some analysts to call it the beginning of a long-awaited correction.

"In 2013 the list of concerns in equity markets really narrowed and some of them were not even on the radar, but this year some concerns are back," said Drew Wilson, investment analyst at Fenimore Asset Management.

"Last year markets gave corporations an amnesty on earnings, regardless of what they were, but this year corporations need to prove their profits are sustainable before being rewarded," Wilson said.

Read: S&P 500 companies are beating estimates at their usual pace

"Today's drop on the S&P 500 still puts us within 5% of the record high and this environment is certainly beginning to be good for value investors, who had a difficult time last year as bargains were scarce," he added.

"We think the flight to quality will continue, as investors realize how much profit they have made in the S&P 500 last year. This kind of selling could well be a spark for the correction," said Uri Landesman, president at Platinum Management.

Investors digested earnings results from several heavyweights in a day with no U.S. economic data. Some earnings provided a bright spot in an otherwise gloomy session.

Kimberly Clark Corp. (KMB)announced its fourth-quarter earnings and jumped to $539 million, or $1.40 per share, beating analysts' expectations. Shares in the consumer-goods company rose 1.9%.

Procter & Gamble Corp.'s (PG) profit fell, but its core earnings beat expectations. Shares in Procter & Gamble rose 1.2%.

Shares in Care.com (CRCM) jumped 43% on their debut, after the non-medical-care management company sold shares at $17, the higher range of its initial offer.

Shares of Microsoft (MSFT)(MSFT) bucked a weaker tech tone, up 2.1% after the company beat Wall Street estimates with fourth-quarter results released after the market close on Thursday.

Shares of Starbucks (SBUX) were up 2.2% after the coffee giant posted a 25% rise in profit, though sales missed Wall Street's targets.

Among the losers, Honeywell International Inc. (HON) shares fell in a choppy trade and were down 1.5% as the company's quarterly earnings missed expectations.

Bristol-Myers Squibb Co. (BMY) reversed earlier gains and dropped 5.6% in spite of the pharmaceutical company reporting a better-than-expected rise in revenue and earnings.

EBay Inc. (EBAY) fell 1% after Carl Icahn said he is ready for a proxy fight to win two seats on the board of the online auctioneer, with the intent of pushing eBay to spin off PayPal.

More must-reads from MarketWatch:

Follow the U.S. markets on the live blog

Latest from Davos: Summers on the future of monetary policy

How about a 50% crash?

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

Starbucks (NASDAQ:SBUX)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more Starbucks Charts.
Starbucks (NASDAQ:SBUX)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more Starbucks Charts.