And then there are the M-Disk: http://www.extremetech.com/computing/92286-m-disc-is-a-dvd-made-out-of-stone-that-lasts-1000-years. USD DOD test: http://www.mdisc.com/uploads/M-DISC_1sheet_ChinaLake_vF.pdf. Down side, requires writer that is M-Disk capabale, and disk are expensive (ie about 3 bucks per disk.
The Shaanxi earthquake's epicenter was in the Wei River Valley in Shaanxi Province, near the cities of Huaxian, Weinan and Huayin.
The M7.3 earthquake occurred on the strike-slip White Wolf Fault in the southern San Joaqin Valley. Historically, the left-lateral fault has had a component of reverse slip, and at the time of the July mainshock the ratio of reverse/left-lateral slip was about 1.2:1.