* Economies in partial shutdown as coronavirus spreads
* Other central banks act after Fed cash injection
* China cuts banks' reserve requirements
* BoJ pledges bond buys, short-term loans
* Norway cenbank cuts rates, Sweden offers loans
* (Adds details about the Federal Reserve's Treasury purchases; adds New York dateline and byline)
HONG KONG/LONDON/NEW YORK, March 13 (Reuters) - Central banks worldwide acted to shore up money markets after cratering share prices drove a rush for cash, hitting many regional currencies and threatening a surge in short-term borrowing costs.
In China, which bore the brunt of the economic fallout from the coronavirus in the first few months of 2020, authorities late on Friday cut banks' reserve requirements for the second time this year.
The U.S. Federal Reserve followed suit with a wave of $37 billion of Treasury bond purchases, accelerating the enhanced market liquidity measures announced Thursday.
With most developed economies moving into partial shutdowns as the epidemic tightens its global grip, Norway and Sweden announced far-reaching stimulus packages as European trading got under way.
European Central Bank President Christine Lagarde, meanwhile, drew fire for not doing more after the ECB announced relatively modest measures on Thursday, when the Federal Reserve injected half a trillion dollars into the U.S. banking system.
"We should see more action from central banks because what we need here is a short-term liquidity bridge," said Mohammed Apabhai, head of Asian trading strategy for Citigroup. "The issue is that if we don't see that, then this situation risks becoming a more systemic problem."
Early on Friday, Japan's central bank pledged to release cash into the markets by buying 200 billion yen ($1.90 billion) of five-to 10-year government bonds and injecting a further 1.5 trillion yen in two-week loans.
Sources told Reuters that Japanese government and central bank officials were more seriously weighing the risk of cancellation of the Olympic Games, scheduled for Tokyo in July, when making economic projections for this year.
China's central bank said it was cutting target-compliant banks' reserve requirement ratios (RRR) by 50-100 basis points, releasing 550 billion yuan ($79 billion) to shore up the economy.
Norway's central bank joined the growing list of monetary authorities that have slashed borrowing costs in recent days with an unexpected half-point cut in its key policy rate. It also offered the first in a series of emergency three-month loans to the banking industry.
Sweden's central bank said it would lend up to 500 billion Swedish crowns ($51 billion) to local firms via banks to ensure they had access to credit.
Some companies have begun hoarding cash and accessing credit lines, looking to balance the need to pay wages and overheads as their income is hit by the drop in everyday activity.
Air France KLM, like other major airlines heavily exposed to global flight restrictions imposed to fight the outbreak, said it had drawn down on 1.1 billion euros ($1.2 billion) worth of its revolving credit facility.
GIANT FED STICKING PLASTER?
The succession of central bank moves came after the U.S. Federal Reserve on Thursday surprised markets by offering to inject up to $1.5 trillion into the financial system on Thursday and Friday.
That unscheduled offer of effectively unlimited dollars came as U.S. stocks plunged nearly 10% in their biggest one-day losses since the 1987 market crash. The Fed was trying to avoid the credit market paralysis that occurred during the 2008 global financial crisis.
Dealers accepted only $119 billion of the offerings, but the move sent a message that the central bank was willing to provide liquidity as needed, analysts said.
Heartened by the Fed's cash bonanza, European stock markets on Friday clawed their way tentatively back from their worst day ever while the dollar posted broad gains and U.S stock index futures jumped.
But world stocks remained on course for their worst week since the financial crisis, and deep-seated concerns about Italy - epicentre of Europe's coronavirus outbreak - extended losses for its government bonds after their worst day in nine years.
In a foretaste of what may come for other countries, China's exports contracted sharply in January and February amid massive disruptions to business operations and supply chains, data showed.
The European Central Bank gave support on Thursday by offering banks loans with rates as low as minus 0.75%, below the ECB's minus 0.5% deposit rate, and promised to increase bond purchases.
However, it did not cut benchmark interest rates as many investors had expected, and Lagarde faced criticism for saying it was not the central bank's job to help virus-stricken euro zone countries struggling in the debt markets.
In Tokyo, sources familiar with the Bank of Japan's thinking said it might take further action next week by topping up purchases of commercial paper and corporate bonds.
Ayako Sera, market strategist at Sumitomo Mitsui Trust Bank in Tokyo, said such moves were a possibility. "But this only benefits large companies. Something else is needed to direct support to small firms," Sera added
Earlier in Asia, Indonesia's central bank bought 6 trillion rupiah ($405 million) of government bonds in an auction, after Australia's central bank injected A$8.8 billion ($5.52 billion), an unusually large sum, into its financial system.
In South Korea, like Italy on the frontline of the outbreak, the finance ministry met and agreed to cooperate with its central bank, following speculation that an emergency interest rate cut could be coming. (Reporting by Jonnelle Marte in New York, Wayne Cole in Sydney, Stanley White in Tokyo, Cynthia Kim in Seoul, Terje Solsvik in Olso and Johan Ahlander in Stockholm; Writing by Jennifer Hughes and John Stonestreet; Editing by Sam Holmes, Catherine Evans, Carmel Crimmins and David Gregorio)