Magnitude 4.0 event near Lop Nor, China - earthquake or nuclear test?
Last updated: 2006-10-12 13:05:28 PDT
Quick Links
- Location map
- Initial source parameters
- Vertical components [all KNET stations]
- Get waveforms via ftp in SEED format with CSS3.0 arrival, assoc, origin, and event tables.
![Vertical components [all KNET stations]](images/vert_08_30.gif){kind=link}
Translations
A large earthquake, preliminary estimate mb=4.04 ms=3.08, occurred near the Lop Nor nuclear test site for China. These tests were recorded by the Kyrgyzstan Seismic Network (KNET) situated approximately 1200 km away with a back azimuth of 90°. Preliminary analysis suggests this is an eathquake and not a man-made explosion.
This map shows the mainshock as a red star. KNET array stations are yellow triangles. Pakistan and Indian nuclear test sites are yellow diamonds. Blue lines are major rivers and red lines are international borders.
Event Map
The figure below shows the vertical components for 10 KNET stations (click here for an enlarged image).
Event Parameters
Event solution
The following origin is preliminary:
| Latitude | Longitude | Depth | Origin Time | mb | ms | Author |
|---|---|---|---|---|---|---|
| 41.9434 | 88.4513 | 96.720km | 1/27/1999(027), 06:25:03.4 | 4.04 | 3.08 | UCSD: Vladik |
| 41.6258 | 88.4711 | 18.80km | 1/27/1999 (027) 06:25:01.5 | 3.9 | 3.4 | REB |
Arrival times at KNET stations
| Station | Channel | Arrival Time | Phase | SNR | Delta | Azimuth |
|---|---|---|---|---|---|---|
| AAK | BHZ | 1/27/1999 6:27:30.101 | P | 6.73 | 10.336 | 89.10 |
| KBK | BHZ | 1/27/1999 6:27:25.700 | P | 40.03 | 10.003 | 89.51 |
| KZA | BHZ | 1/27/1999 6:27:23.270 | P | 19.80 | 9.800 | 86.35 |
| TKM2 | BHZ | 1/27/1999 6:27:19.388 | P | 19.49 | 9.529 | 91.51 |
| UCH | BHZ | 1/27/1999 6:27:30.545 | P | 14.74 | 10.337 | 86.88 |
| ULHL | BHZ | 1/27/1999 6:27:12.304 | P | 5.92 | 9.057 | 87.80 |
| USP | BHZ | 1/27/1999 6:27:29.737 | P | 3.73 | 10.342 | 92.57 |
| CHM | BHZ | 1/27/1999 6:27:27.415 | P | 2.23 | 10.149 | 91.30 |
| EKS2 | BHZ | 1/27/1999 6:27:37.178 | P | 2.77 | 10.863 | 88.81 |
| AML | BHZ | 1/27/1999 6:27:38.478 | P | 3.26 | 10.948 | 86.02 |
| UCH | BHN | 1/27/1999 6:29:28.023 | S | -1.00 | 10.337 | 86.88 |
| ULHL | BHE | 1/27/1999 6:28:52.996 | S | -1.00 | 9.057 | 87.80 |
| TKM2 | BHE | 1/27/1999 6:29:06.197 | S | -1.00 | 9.529 | 91.51 |
| KZA | BHE | 1/27/1999 6:29:14.069 | S | -1.00 | 9.800 | 86.35 |
| AAK | BHN | 1/27/1999 6:29:26.365 | S | -1.00 | 10.336 | 89.10 |
| CHM | BHE | 1/27/1999 6:29:21.270 | S | -1.00 | 10.149 | 91.30 |
| KBK | BHN | 1/27/1999 6:29:18.073 | S | -1.00 | 10.003 | 89.51 |
KNET is ideally situated to record events at many test sites in the area. Last May we recorded the nuclear tests conducted by both Pakistan and India. Click here to view a map showing a close-up of the KNET array.
Visit our pages on the Pakistan and India nuclear tests.
URL: http://eqinfo.ucsd.edu/special_events/nuclear_tests/china/1999-01-27.php [Last updated: 2006-10-26 (299) 23:11:31 UTC]