By Anjani Trivedi, Mia Lamar and Gregor Stuart Hunter 

As wild swings in Russia's ruble fan fears of a crisis in emerging markets, veterans of the late-1990s Asian financial crisis say they have been surprised by market fluctuations but note the region's economies are showing few signs of heading toward another meltdown.

Ewen Cameron Watt, chief investment strategist for BlackRock Inc.'s investment institute, ran an emerging-markets fund during the Asian financial crisis. At the time, currency crises raged throughout the region, stock markets slid and severely indebted nations and companies defaulted.

Mr. Watt said he watched an investment in an Indonesian supermarket chain "go up in flames," literally.

"They turned on the television and there was the mob burning down the supermarkets," he said.

The recent bout of volatility in Russia hasn't seen the same kind of drama. It has, however, defied textbook assumptions about currency crises and created uncertainty in emerging markets from Brazil to Indonesia. Russia has a floating currency and sizable foreign-exchange reserves, both of which are traditionally expected to serve as a buffer against a quick drop in a currency's value.

"One of the things about exchange-rate crises is that it's almost unprecedented in history for a floating currency to devalue in more than 50% in one go," Mr. Watt said. So far this year, the ruble has lost almost half its value against the dollar.

Analysts too point to a starkly different economic landscape in Asia today than the late 1990s, when most currencies in Asia were pegged to the strengthening U.S. dollar. As the dollar rose, so did Asian currencies, putting pressure on the region's competitiveness. When the currency pegs came undone during the crisis, some countries struggled to pay back their massive foreign borrowings that had driven much of their growth, as the value of their currencies collapsed.

Today, exchange rates are largely determined by how much investors are buying and selling in the market and adjust in value as pressure mounts. Countries have bigger war chests to fight off any signs of crisis or speculative attacks on their currency. Foreign-exchange reserves across the region are seven times larger, on average, than they were in 1997. India's central bank has been stocking up on foreign-exchange reserves after its currency dropped 11.5% in 2013. Indonesia and Thailand have taken similar action.

Countries, too, have more prudent economic policies, and productivity has increased. Total debt levels in the region have risen to similar levels as seen in the late 1990s, although remain largely denominated in local currencies, reducing the risk of currency mismatches. And, countries have reduced their short-term borrowings with governments across the region amassing foreign-exchange reserves that amount to, on average, more than three times their debt obligations.

The Russian currency closed up 1% on Thursday, after recovering more than 10% of its value during the week, after the country's finance ministry said it would start selling its foreign-currency holdings. Oil prices, which have plummeted for months on ample supply from oil-producing nations, recovered modestly. On Friday, oil prices traded at $59.42 a barrel, up 0.13% from the day before. The U.S. Federal Reserve said it would be "patient" before raising interest rates at its latest meeting, a good sign for higher-return emerging markets.

Still worrying, though, is the concentrated nature of the debt among weaker firms in India and Indonesia, according to a recent report from the International Monetary Fund. China's slowing growth and rising borrowing costs also pose issues, the agency said. The U.S. dollar, too, has broadly rallied this year as the U.S. economy stages a recovery, making the currency more attractive.

Investors have already started to leave Asia's emerging markets. For the past month, emerging Asian stocks and bond funds have recorded net outflows--a reversal from the $105 billion that had poured in through November. For the first time since March, investors have pulled money out of emerging-market debt.

"There is some potential contagion in emerging bond markets, but I don't think it could be anywhere as extreme as what happened in 1998 for Asia, " said George Long, who founded Lim Advisors Ltd. in 1995, making it one of Asia's oldest hedge funds.

Mr. Long remembers the 1997-1998 Asian financial crisis as one of severe turmoil. One of Lim's prime brokers, which lend securities and provide services to hedge funds, lost its credit rating, and a counterparty of the firm, Peregrine Investments Holdings Ltd., collapsed in spectacular fashion.

"It's very different this time," Mr. Long said. "Asia in general is not that leveraged." He noted two exceptions--China's debt-laden banking sector and Australia, where household debt is fairly high.

Government officials this week dismissed comparisons to the 1990s crisis.

The Indonesian rupiah hit its weakest level in 16 years on Tuesday, forcing its central bank to intervene in the foreign-exchange market and buy government bonds to halt the spiking bond yields, which move inversely to prices.

"The (big) problems in 1998 [were] political," said senior deputy governor Mirza Adityaswara of Bank Indonesia on Wednesday. "We believe the recent rupiah fall is temporary because our economic fundamental and fiscal standings are improving."

I Made Sentana contributed to this article.

Write to Anjani Trivedi at anjani.trivedi@wsj.com and Mia Lamar at mia.lamar@wsj.com

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