EARTHQUAKE / THE LONG ROAD BACK : QUAKE FACTS

Here are some facts and figures on Monday’s magnitude 6.6 earthquake:

* DEATHS: 51

* AFTERSHOCKS: A magnitude 3.6 aftershock was the hardest to hit the Southland Thursday.

* DAMAGE: Earthquake damage costs could range from $15 billion to $30 billion, Gov. Pete Wilson estimated, making it the most expensive natural disaster in California history. Losses suffered in the 1989 Loma Prieta earthquake in the San Francisco Bay Area totaled about $7 billion.

* INJURIES: More than 2,300 people were treated and released at hospitals; about 530 were admitted for care.

* CURFEW: The 11 p.m.-to-dawn curfew for Los Angeles was canceled on Thursday.

* ARRESTS: The Los Angeles Police Department has taken 178 people into custody in a three-day period. Most were general arrests and not for curfew violations or looting. On a typical day, there would be about 550 arrests.

* HOMELESS: About 6,000 people spent Wednesday in Red Cross shelters in Southern California, while another 700 bedded down at Salvation Army facilities. Since the quake, the Salvation Army reportedly has fed about 18,700 people and supplied about 15,000 gallons of water to victims. The Red Cross has served about 35,000 meals.

* NATIONAL GUARD: A total of 2,579 National Guard troops have been mobilized. The National Guard has committed more than 1,000 soldiers--in day and night shifts of 500--to conducting security patrols at shopping malls and selected sites in quake-damaged areas.

* UTILITIES: Electricity was restored to all parts of Los Angeles except for 7,500 customers in the San Fernando Valley. About 36,000 DWP customers, mostly in the northwest Valley, still did not have water as of Thursday.

* TRANSIT: The Metropolitan Transportation Authority set up a line dubbed the Westside Special to help commuters cope with the shutdown of the Santa Monica Freeway (I-10). Buses on Line 634 leave every 20 minutes during weekday morning and evening rush hours, or as demand warrants. The one-way fare is $1.50.

* SCHOOLS: More than 200 school buildings have been seriously damaged or destroyed. All Los Angeles school district campuses will remain closed through Friday. Some San Fernando Valley schools could remain closed for several weeks. For information on specific school sites, call (213) 625-4000, or (213) 625-4643 for information in Spanish. The Roman Catholic Archdiocese of Los Angeles reports that 93% of its schools will be open. L.A. Mission College will be closed through Monday.

* MAIL: Residents whose homes have been declared uninhabitable can claim their mail at the local post office. For information, call (818) 757-2100 from 8 a.m. to 5 p.m., Monday through Friday.