With economists fearing high unemployment stemming from the pandemic, the housing finance system is grappling with how it will recoup lost revenue from delinquencies, forbearance plans and other tremors.

The $16 trillion U.S. mortgage market — epicenter of the last global financial crisis — is suddenly experiencing its worst turmoil in more than a decade, setting off alarms across the financial industry and prompting the Federal Reserve to intervene.

The central bank's sweeping actions suggest a cash shortage gripping sectors directly hit by the pandemic. Banks were supposed to be protected by Dodd-Frank but are still vulnerable to a funding domino effect.

The rush to unload mortgage-backed securities signals that a credit meltdown that began with corporate bonds is spreading to other corners of the market.

The Federal Reserve committed Monday to conducting more asset purchases of Treasury securities and mortgage-backed securities and announced $300 billion in new financing for credit facilities.

Accommodations for borrowers affected by the coronavirus pandemic, such as payment delays and fee waivers, are "positive and proactive actions that can manage or mitigate adverse impacts," the regulators said.

Mark Calabria said Fannie Mae and Freddie Mac are currently equipped to handle elevated delinquencies, but they might need congressional or Federal Reserve help if fallout from the coronavirus persists.

A number of proposals have been floated for debt payment holidays and other types of moratoria, but such approaches offer solutions that are worse than the problems.

Mortgage rates rose sharply this week as originators looked to manage the overwhelming demand from consumers, according to Freddie Mac.

Mortgage real estate investment trusts are taking stock of their financial ability to respond to market shocks and other concerns stemming from the coronavirus.