mysterious grumble

there~s something that has happened twice that scares the life out of me. christine experienced it with me once and it just happened again. it~s a deep, dark grumble coming from the belly of the earth and i don~t know what it is. we don~t have earthquakes here and there are no volcanoes nearby. i don~t know what the sound is but it is tremorous and powerful, lasting about 2 seconds. i fear landslides being that i live on a mountain whose earth commonly washes away. i don~t hear anything after these mysterious scares but the sound of every dog in the neighborhood barking. they~re probably saying what christine and i said to each other when we heard it the first time: "what the fuck was that??"