Gunn had counted too fast during his adrenaline rush to clear the floor and stepped back just as the third acoustic blast fired. Jamming his palms to his ears, he looked down as saw that the device was now firing through a thin layer of concrete that had formed the foundation for the building.
"Nothing I can do about that," he muttered after the blast passed, and he made his way to the door.
Tugging open the heavy door, he half expected to face a legion of armed guards waiting for him to exit.
But the guards had all rushed to the residence, at least temporarily. Instead, he saw a small group of scientists, some in pajamas, swarming at the opposite end of the hallway. Stepping through the chamber door, Gunn was met by a yell from one of the scientists, spurring the angry mob to charge toward him.
With just a few yards of leeway, Gunn rushed to the nearest office on his right and stepped in.
Like most of the offices in the lab building, it was sparsely decorated, with a gray metal desk centered on one wall and a lab table covered with electronics to the side. None of the furnishings mattered to Gunn. The only thing of importance was the small picture window that faced the compound grounds.
Stepping to the window, he silently thanked Giordino for loaning him the crowbar now gripped tightly in his hands. With a powerful thrust, he jabbed the blunt end of the bar into a corner of the window, shattering the glass. Scraping the broken shards off the sill, he dove out the window. His body barely hit the ground when the fourth and final blast emitted from the acoustic array, the impact much less violent to Gunn now that he was outside the building.
A chorus of frantic yells could be heard through the broken window as the scientists ignored Gunn and rushed into the chamber. He knew they would deactivate the system before another blast would strike.
His rash gamble at inducing an earthquake was finished. So too, he thought with dread, was his chance at saving the lives of Pitt and Giordino.
-57-
When the sound of the second blast echoed across the compound, Borjin ordered two of the mounted guards to go investigate. They quickly galloped across the darkened compound as a slight rumble echoed in the distance. The deep boom of a third seismic blast quickly drowned out their pounding hoofbeats and the faraway rumble as well.
"You have brought friends as well?" Borjin sneered at Pitt.
"Enough to close you down for good," Pitt replied.
"Then they shall die with you."
A crash of shattering glass sounded from the laboratory, followed by the fourth detonation of the acoustic seismic array. Then all fell silent.
"It would appear that your friends have been introduced to my guards," Borjin smiled.
The sneer was still on his face when another distant rumble reverberated off the hills like the sound of approaching thunder. Only this time, the rumble continued to resonate, growing with the intensity of an approaching avalanche. Outside the compound walls, a pack of wolves nearby began howling in mournful unison. The horses inside the compound picked up the cue and began neighing loudly, in nervous anticipation of the pending cataclysm that their human counterparts could not foresee.
A thousand meters below the surface, a trio of condensed sound waves, fired from the three transducers, converged at the angled fracture targeted by Gunn. The sedimentary cut was indeed an ancient oblique fault. The first two blasts of the seismic array, dissipated by the chamber's shielding, had struck the fault with only a minor pulse. The third blast, however, hit with the full power of the convergent shock waves. Though the sediment held firm, the seismic waves rocked with a vibrating force that rattled the fault line. When the fourth blast arrived, it would prove enough to break the camel's back.
A fault line, by nature, is a rock fracture prone to movement. Most earthquakes are the result of energy released from a slippage in a fault zone. Pressure builds up at a point along the fault due to underlying tectonic movement until a sudden slippage relieves the strain. The slippage reverberates to the surface, sending out a variety of shock waves that create a surface-rattling earthquake.
For the fault beneath the Mongolian mountainside, the fourth and final barrage of acoustic waves struck like a torpedo. The seismic vibrations jolted the fracture, causing it to slip in both vertical and horizontal directions. The buckle was small, just a few inches spread across a quarter-mile rift, but because it was close to the surface the wave impact was dramatic.
The shock waves burst through the ground in a sinister turmoil of vertical and horizontal shaking. By the Richter scale, the resulting quake would measure a 7.5 magnitude. But the scale didn't reflect the true intensity on the surface, where the shaking felt ten times more powerful to those standing on the ground.
For Pitt and the others, the motion was preceded by the low rumble, which grew in intensity until it sounded as if a freight train was rumbling by underground. Then the shock waves reached the surface and the ground beneath their feet began to gyrate. At first, the ground shook back and forth. Then it seemed to break loose in all directions, steadily increasing in force.
Pitt and the guards eyed each other warily as the quake started, but the violent shaking soon tossed everyone off their feet. Pitt watched as one of the guards fell backward onto the porch steps, his machine gun sprawling at arm's length. Pitt didn't fight to stay standing but instead dove to the ground, throwing his arms and the .45 out in front of him. The smaller, lighter weapon gave him a sudden advantage over the guards, and he zeroed in on the closest man still standing and squeezed the trigger. Despite the vibration, Pitt hit his target, and the man sprawled backward to the ground. Pitt quickly swept his gun toward the second guard, who was crouching on his knees to stabilize himself. Pitt fired three times in succession as the guard let loose a return burst from his AK-74. Two of Pitt's three shots struck home, killing the guard instantly while the guard's errant burst peppered the ground to Pitt's left side.
Pitt immediately swung his muzzle toward the first guard, who had fallen down just in front of Borjin. The Mongolian tycoon had scrambled up the steps at the first gunshot and ducked behind the door as Pitt turned in that direction. The guard was scrambling after Borjin and just reached the doorstep when Pitt fired once. Another shot rang out behind him, fired by Giordino after he body-slammed Tatiana to the ground. The shaking was at its zenith and proved too great for either man to aim accurately. With a staggering lunge, the guard dove through the residence door unscathed.
At the other end of the driveway, the mounted guards had been of little concern. A chorus of snorts and whinnies still blared from the horses, who had no conception of why the ground was shaking beneath their hooves. Three of the terrified horses reared repeatedly, their riders clutching the reins for dear life. A fourth horse up and bolted, galloping full tilt across the drive, stomping the bodies of the dead guards as it streaked petrified toward the horse corral.