(CNN) For residents of the Big Island of Hawaii, Friday was a day of fraught nerves as a strong earthquake shook their homes, which are increasingly threatened by a volcanic eruption that doesn't show any signs of slowing down. 
 
 The magnitude 6.9 temblor that jolted the island was one of more than 110 earthquakes in just 24 hours. It knocked out power to some residents who were already dealing with mandatory evacuation orders, molten rock and high levels of sulfur dioxide in the air. 
 
 The situation wasn't getting any better, Civil Defense Administrator Talmadge Magno told reporters Friday afternoon. 
 
 "Activity continues. It doesn't look like it is slowing down," he said. 
 
 Magno said five volcanic vents have opened and indicated that at least one home and another structure were destroyed by lava. 
 
 It is highly unusual to see the vents so far from Kilauea volcano, he said. 
 
 Hundreds of people have evacuated from Leilani Estates, a community of about 1,700 people, and Lanipuna Gardens. Harry Kim, mayor of Hawaii County, said the government will support residents, including those who want to go back to their homes to pick up some belongings. 
 
 "We have to work with them as to how we are going to minimize (the inconveniences) as best as possible," he said. The mayor said people who want to check on their homes would be allowed into the neighborhoods. 
 
 A photo provided by Shane Turpin shows the results of the Kilauea volcano's eruption early Friday. 
 
 'We had to evacuate,' resident says 
 
 Stephen Clapper said there was no choice. 
 
 "We had to evacuate. My mother was out of portable oxygen, so that's a first concern. She's 88 years old," he told CNN affiliate KHON 
 
 Clapper became one of hundreds of residents to flee the threats from the volcanic eruption. He said he told his mom on Friday morning to pack a bag, just in case. 
 
 But with lava setting trees ablaze and threatening homes, and with gas coming out of cracks in the ground, Clapper went back to the house, got his mother and the dogs, swept up some of his clothes in one arm, and took off for a shelter. 
 
 Cracks in Kilauea volcano's rift zone -- an area of fissures miles away from the summit -- erupted Thursday and early Friday, spurting lava near the island's eastern edge. 
 
 US Geological Survey seismologist Jana Pursley said there have been 119 earthquakes on the Big Island since Thursday afternoon. The USGS said Friday's 6.9 quake was the most powerful on the island since 1975. 
 
 Steam rises from cracks in the road near Leilani Estates on Friday. 
 
 About 14,000 customers of Hawaii Electric Light lost power immediately after the earthquake. 
 
 "We've had some unofficial reports there (is) some damage to some buildings," spokeswoman Rhea Lee-Moku said. 
 
 Lee-Moku said power has been restored to about half of the customers who were without, but sulfur gas levels in some areas are beyond what Hawaii Electric Light deems safe so they cannot work in those places. 
 
 "When you are exposed to that level of SO2 in the Leilani Estates area you need more protection than we have available to us," she said. 
 
 KHON reported that some viewers on the island of Oahu, about 200 miles away, felt the shaking. 
 
 Lava shoots into the air 
 
 Video posted on social media showed lava spewing several feet into the air from a new crack in a Leilani Estates street. Aerial videos showed lava searing a long orange and smoky line through a wooded area. 
 
 Jeremiah Osuna, who used a drone to record one of the videos Thursday, said the area "sounded like if you were to put a bunch of rocks into a dryer and turn it on as high as you could," according to KHON. 
 
 As authorities watch, Leilani Estates residents line up on the road leading to the area. 
 
 "You could just smell sulfur and burning trees and underbrush and stuff," Osuna said, according to the TV station. "I couldn't believe it. I was kind of shaken a little bit and realizing how real everything is, and how dangerous living on the East Rift can be." 
 
 Leilani Estates resident Meija Stenback told CNN affiliate KITV that she left the area with her family. The eruption came after hundreds of earthquakes shook the eastern side of the Big Island over four days, and residents had been warned an eruption was possible. 
 
 "We knew it was coming, and even now it's ... really surreal at this point," Stenback told KITV. 
 
 A thick plume of smoke and ash also rose Thursday from the Puu Oo volcanic vent, roughly halfway between Kilauea's caldera and Leilani Estates. 
 
 A plume of ash rises from the Puu Oo volcanic vent Thursday in this US Geological Survey photo. 
 
 Concerns about sulfur dioxide 
 
 Destructive molten flows weren't the only concern. Volcanic eruptions can release potentially dangerous sulfur dioxide -- and fire department personnel have detected high levels of the gas in the evacuation area, the civil defense agency said. 
 
 Exposure to high levels of sulfur dioxide could be life-threatening, according to the federal Agency for Toxic Substances and Disease Registry 
 
 Breathing large amounts of sulfur dioxide could result in burning of the nose and throat and breathing difficulties, the agency says. 
 
 Senior citizens, the young and people with respiratory issues have extra incentive to leave the evacuation zone, because they are especially vulnerable to the gas, the state's Emergency Management Agency said 
 
 Gov. David Ige said he's activated the Hawaii National Guard to help with evacuations and security. 
 
 "I urge residents in Leilani Estates and the surrounding areas to follow instructions. ... Please be alert and prepare now to keep your family safe," he tweeted. 
 
 The Guard will do security patrols and help evacuate residents, Hawaii Adjutant General Arthur "Joe" Logan said. 
 
 Kilauea is one of the world's most active volcanoes. It's in Hawaii Volcanoes National Park , which closed Friday. 
 
 Check out this photo of the #lava on Mohala Street in Leiliani Estates that was taken by our crew earlier today. Please be safe everyone! https://t.co/wMo5BzSMAh @NWSHonolulu pic.twitter.com/cPUuGXGMp8 — HawaiiElectricLight (@HIElectricLight) May 4, 2018 
 
 Since Monday, several hundred earthquakes -- most of them around magnitude 2.0 -- have been recorded in the area. The series of quakes came after a collapse of a crater floor of Puu Oo. 
 
 New map of locations of first three eruptive fissures in Leilani Estates Subdivision (Hawaii) as of this morning (May 4). Fissures are jetting sulfur dioxide gas and lava spatter. Updated maps will be posted on the USGS-Hawaiian Volcano Observatory page at https://t.co/TD5y5GV1Xk pic.twitter.com/ACS76UibXv — USGS Volcanoes🌋 (@USGSVolcanoes) May 4, 2018 
 
 The tremors have jarred residents, who've been reporting nearly constant ground vibrations. They have also reported cracks in roads. 
 
 "It has now become unnerving," resident Carol Shepard told KHON. 
 
 She said the flurry of earthquakes seemed to happen every minute. 
 
 "It'd be like the house would shake. It'd be like somebody that weighs 300 pounds came in my living room, and jumped up and down," she said. ||||| A driver makes a U-turn as the road was blocked by authorities after Hawaii County ordered evacuations for all of Leilani Estates, near the town of Pahoa on the Big Island, Hawaii, Thursday, May 3, 2018,... (Associated Press) 
 
 A driver makes a U-turn as the road was blocked by authorities after Hawaii County ordered evacuations for all of Leilani Estates, near the town of Pahoa on the Big Island, Hawaii, Thursday, May 3, 2018, following eruption of Kilauea volcano. (KHON via AP) (Associated Press) 
 
 HONOLULU (AP) — The Latest on eruption of Hawaii's Kilauea volcano (all times local): 
 
 8:30 p.m. 
 
 Hawaii Gov. David Ige has signed an emergency proclamation after Kilauea Volcano erupted Thursday and a lava flow emerged in a residential neighborhood. 
 
 The proclamation provides state money for response efforts. 
 
 There are about 770 structures in the subdivision where lava is flowing onto the streets on the Big Island. 
 
 A statement released by the governor's office says the "danger is of such magnitude that it warrants preemptive and protective action in order to provide for the safety, health and welfare of the residents." 
 
 Ige says he's in contact with Hawaii County officials and supporting emergency response efforts. Ige also activated the Hawaii National Guard to help with mandatory evacuations and security. 
 
 ___ 
 
 8:10 p.m. 
 
 Volcano officials in Hawaii say there is no way to predict how long this latest eruption on Kilauea Volcano will continue. 
 
 The Big Island volcano began erupting Thursday, sending lava flowing through a subdivision and prompting the evacuation of about 1,500 residents. It was not an explosive event, where lava shoots skyward in dramatic fashion. 
 
 Asta Miklius is a geophysicist with the U.S. Geological Survey Hawaiian Volcanoes Observatory. She tells The Associated Press that there quite a bit of magma in the volcano's system. 
 
 She says it won't be an eruption that only lasts hours. But she says how long it will last will depend on whether the summit magma reservoir gets involved. 
 
 7:25 p.m. 
 
 One Hawaii resident described a line of lava snaking through forest land as a "curtain of fire." 
 
 Jeremiah Osuna captured the footage of the lava stream with a drone after Kilauea Volcano erupted Thursday on Hawaii's Big Island. Residents of a subdivision have been ordered to evacuate after lava flows appeared in the Leilani Estates neighborhood 
 
 Osuna says it wasn't just a visual experience. He tells Honolulu television station KOHN that the sound was overwhelming. The only thing comparable is if someone "put a bunch of rocks into a dryer' and turned it on high. 
 
 He also says he could smell the sulfur, along with the burning trees and other vegetation. 
 
 ___ 
 
 6:35 p.m. 
 
 One resident on the southern part of Hawaii's Big Island says lava fountains were shooting 150 feet (45 meters) in the air through a crack at Kilauea volcano. 
 
 Ikaika Marzo told the Honolulu Star-Advertiser that lava spread out over an area about 200 yards (182 meters) wide behind one house in Leilani (LAY-lah-nee) Estates on Thursday. 
 
 He says it sounds like a jet engine. 
 
 The U.S. Geological Survey says new ground cracks were reported Thursday afternoon. Hot vapor emerged from a crack and spattering lava began to erupt. 
 
 Hawaii County is ordering evacuations for all homes in Leilani Estates. 
 
 ___ 
 
 6:05 p.m. 
 
 Hawaii County is expanding its evacuation order in response to the eruption of Kilauea volcano. 
 
 The county is now calling for all residents in the Leilani (LAY-lah-nee) Estates subdivision to evacuate. Earlier, the order was limited to just part of neighborhood. 
 
 The subdivision on the Big Island has a population of about 1,500 people. 
 
 The U.S. Geological Survey says new ground cracks were reported Thursday afternoon. Hot vapor emerged from a crack and spattering lava began to erupt. 
 
 The USGS says areas downslope of the erupting vent are at risk of being covered by lava. Currently, the Leilani Estates area appears to be at greatest risk. 
 
 But scientists say new vents and outbreaks could occur and it's not possible to say where. 
 
 ___ 
 
 5 p.m. 
 
 Hawaii's Kilauea volcano is releasing red lava into a residential subdivision, prompting the county to order mandatory evacuations. 
 
 Hawaii County spokeswoman Janet Snyder said Thursday red lava emerged on Mohala Street in the Leilani Estates subdivision. The county is ordering evacuations for homes from Luana Street to Pohohiki Road. 
 
 The eruption comes after days of earthquakes rocked the Puna district of the Big Island. 
 
 Earlier in the week, the crater floor of the Puu Oo (POO'-oo OH'-oh) vent collapsed. That caused magma to push more than 10 miles downslope toward the populated southeast coastline of the island. ||||| (CNN) Firefighters went door-to-door urging some residents of Leilani Estates on Hawaii's Big Island to leave as lava from the Kilauea volcano continued to flow, threatening more homes. 
 
 "Any residents remaining in the current affected areas should evacuate now," said an emergency message from the Hawaii County Civil Defense. 
 
 Thick waves of fresh lava from fissure 22 and 7 -- which officials say are producing the largest amount of lava -- are blazing down a mound of volcanic rock. 
 
 "It's just a matter of time," resident Steve Gebbie says. "I don't know what's going to be left of Leilani, I really think it might be wiped out." 
 
 On Saturday, the Hawaii County Civil Defense said lava into the subdivision had slowed. Lava continued to enter the Pacific Ocean near MacKenzie State Park. 
 
 A series of volcanic explosions occurred Saturday morning, according to a tweet from USGS Volcanoes. The explosions produced an ash cloud that rose up to 11,000 feet above sea level, the National Weather Service said. Smaller explosions occurred overnight. Moderate winds were blowing to the southwest, and light ash was likely to fall downwind. 
 
 Earlier this week, eruptions sent ash plume 10,000 feet up in the air. More red and orange lava fountains emerged and lava reached the Pacific Ocean, presenting a new threat for residents. 
 
 The oozing lava has destroyed 82 structures on the Big Island, and another 37 structures have become inaccessible in the last days, said Hawaii County Civil Defense Administrator Talmadge Magno. 
 
 About 2,200 acres have been covered in lava since the Kilauea volcano eruptions began May 3, Magno said. 
 
 The US Geological Survey said there were 90 earthquakes of multiple intensities at the volcano summit in about six hours Friday. Earthquakes continued at a moderate rate overnight. 
 
 'This is the Hawaiian way' 
 
 As lava bombs were fired in every direction, Darryl Clinton tried to keep homes on the Big Island from going up in flames. 
 
 Armed with little more than a garden house, he doused lava bombs as they bombarded his and his neighbors' homes, destroying windows, crashing through the roof and igniting parts of the houses. 
 
 "This is the Hawaiian way," his neighbor and close friend Steve Hill said. "You take care of each other." 
 
 Hill's family had packed up their furniture and valuables and left their property, convinced the lava erupting from fissures in the area would consume their slice of paradise. 
 
 The homes are still there, thanks to Clinton's efforts, he said. 
 
 "This place stands because Darryl chose not to go home," Hill said. "It stands because he believed he could save it, and that's it." 
 
 Last week, Hill had pleaded with Clinton to leave the homes and let them burn. The onslaught of molten lava bombs appeared unstoppable, and Clinton's task seemed far too dangerous. 
 
 Clinton didn't listen. The next day, he was standing on Hill's top deck when a lava bomb the size of a bowling ball flew through the air and hit Clinton with such force it snapped the bones in his leg. 
 
 "It just took my leg out and threw me against the wall, the most extreme force I've ever felt in my life," Clinton told CNN from his hospital bed in Hilo. 
 
 Clinton has had at least three surgeries and is in Honolulu for another. He will be off his feet for weeks, but he said he doesn't regret his choice to stay to protect the homes. ||||| After surviving earthquakes and molten lava, residents of Hawaii’s Big Island now have new threats to worry about: steam-driven explosions, hazardous volcanic smog and acid rain. 
 
 The US Geological Survey’s Hawaiian Volcano Observatory on Wednesday warned of possible explosive eruptions in the coming weeks. That could happen because as lava continues to sink in a lake inside a Kilauea crater, an influx of groundwater could interact with the lava to create steam explosions. 
 
 Those forces would emit “ballistic projectiles” — as small as pebbles or weighing up to several tons. The agencies also said ash clouds would rise to greater elevations, dispensing ash over wider areas. 
 
 “At this time, we cannot say with certainty that explosive activity will occur, how large the explosions could be, or how long such explosive activity could continue,” an advisory said. 
 
 Gov. David Ige asked President Donald Trump to issue a disaster declaration for Hawaii as a result of the ongoing earthquakes and volcano eruption, according to a press release. 
 
 The declaration allows federal funds to begin to flow to state and local efforts in Hawaii. The estimated cost to protect residents over the next 30 days is expected to exceed $2.9 million, according to the governor’s office. 
 
 A brief explosion Wednesday on a Kilauea crater was the result of falling rocks and not the interaction of lava with the water table, the USGS said. 
 
 The Kilauea eruption last week created new volcanic vents on the ground miles east of the summit, releasing slow-moving lava and toxic gas into island communities. 
 
 Officials have warned of dangerous levels of sulfur dioxide gas. 
 
 If winds weaken, that gas and other volcanic pollutants can settle easily with moisture and dust to create a haze called volcanic smog, or “vog,” with tiny sulfuric acid droplets that can pose respiratory problems, according to the US Geological Survey. 
 
 Trade winds could weaken Thursday and Friday, meaning the vog that’s largely been accumulating over the ocean south of the Big Island could pool over a larger portion of it, creating possible health hazards, the National Weather Service says. 
 
 And with high chances of rain on those days, sulfuric acid droplets would fall, creating another menace known as acid rain, CNN meteorologist Michael Guy says. 
 
 Respiratory problems 
 
 At higher concentrations, vog can cause headaches and irritation to the lungs and eyes, the University of Hawaii at Hilo says. 
 
 “Because of their small size, aerosol particles such as those in vog penetrate deep into the human lung and are readily retained,” the USGS says. 
 
 High levels of acidic particles in vog “can induce asthma attacks, especially in adolescents, and can also impede the ability of the upper respiratory tract to remove other potentially harmful particles,” it says. 
 
 For people with asthma and other respiratory problems, “the effects are much more serious, causing a tightening of the airways in the lungs and making it very difficult to breathe,” the university says. 
 
 But it adds: “There’s been no clear evidence that vog causes lingering damage to normally healthy individuals.” 
 
 If trade winds become lighter as predicted later this week, vog could pool northward over parts of the island by Friday, the weather service says. 
 
 But winds are forecast to return — and the vog could be pushed off much of the island — by Friday night, it says. 
 
 Similar to battery acid 
 
 If it rains where vog has collected, acid rain would result. 
 
 “Wherever you have a vog plume, you’re going to have acid rain, if it’s raining,” University of Hawaii meteorologist Steven Businger told CNN affiliate Hawaii News Now. 
 
 What are the effects of acid rain? The droplets of sulfuric acid in vog have the corrosive properties of diluted battery acid, the USGS says. 
 
 “When atmospheric moisture is abundant, these droplets combine with it and fall as acid rain, damaging plants and accelerating the rusting of metal objects such as cars, industrial and farm equipment, and building components,” it says. 
 
 The amount of acid rain depends on the concentration of sulfur dioxide in the air, CNN’s Guy says. 
 
 Determining how acid rain affects human health is complicated, and Guy says the effects on the skin are unclear. 
 
 One direct, immediate threat is not the rain, but rather breathing in the particles in the vog — the very pollutants that caused the acid rain, according to the Environmental Protection Agency. 
 
 “Walking in acid rain, or even swimming in a lake affected by acid rain, is no more dangerous to humans than walking in normal rain or swimming in non-acidic lakes,” the EPA says. 
 
 But acid rain can contaminate household water supplies by leaching metals from building and plumbing materials, the USGS says. 
 
 That includes rooftop rainwater-catchment systems that Hawaii residents use for drinking water. 
 
 “In 1988, the drinking water of nearly 40% of homes using such systems in the Kona Districts of the island was found to be contaminated with lead leached by acid rain,” the USGS says. “Tests confirmed that the blood of some residents of these homes had elevated lead levels.” 
 
 Businger told Hawaii News Now that acid rain is not an immediate health hazard, adding that it’s “the least of their (residents) worries.” 
 
 More vents open 
 
 Other dangers persist, not only in the form of lava but also earthquakes and newly formed cracks. 
 
 Two additional volcanic vents — the 13th and 14th — erupted Tuesday in the Leilani Estates area, where roughly 1,700 residents were asked to evacuate last week. At least 36 structures — including at least 26 homes — have been destroyed. 
 
 On Wednesday, a 15th vent formed — this one in the Lanipuna subdivision, the Hawaii County Civil Defense Agency says. 
 
 Residents were being still allowed to check on their properties from 7 a.m. to 6 p.m. each day but must be prepared to leave at a moment’s notice, the Hawaii County Civil Defense Agency says.
– Hawaii's Kilauea volcano has erupted, prompting Gov. David Ige to declare a state of emergency and activate the National Guard. Soldiers have been called in to assist with the mandatory evacuation of the Leilani Estates neighborhood in the Puna district of Big Island, which is in danger of being inundated by lava, the Honolulu Star-Advertiser reports. The eruption sent lava flowing through the subdivision, where vapor is emerging from cracks, and witnesses say they saw fountains of lava rising around 150 feet from a crack in the volcano, reports the AP. Emergency shelters have been opened for around 1,700 people affected by the evacuation order. The eruption follows hundreds of earthquakes over the period of several days, most of them around 2.0 magnitude, CNN reports. The most severe was a 5.0 magnitude earthquake Thursday morning, according to the US Geological Survey. One local man tells KHON 2 that he flew his drone near a "curtain of fire" moving toward residential areas. "It sounded like if you were to put a bunch of rocks into a dryer and turn it on as high as you could," he says. "You could just smell sulfur and burning trees and underbrush and stuff." Scientists say there's a lot of magma in the extremely active volcano's reservoir and they're not sure how long the eruption will last.