Olduvai George Project

Trip # 1

 

The first trip to collect seismic data started on July 27 and ended on August 16. Team members are Kai (July 27 to August 16), Sherif (July 27 – August 9), and Jerry (August 7 to August 16).

A total of 360 CSGs are recorded with shot interval of 10 m and receiver interval of 5 m. The total numbers of receivers are 720. Since we have only 240 receivers at the site, we recorded the data using three phases, phase 1 with receivers 1-240, phase 2 with receivers 241 to 480, and phase 3 with receivers 481 to 720.

During shooting time only part of the receivers were active, we repeated some shots to have overlaps between the 3 phases, and the following table lists which receivers were active during shooting time.

P.S. to have 480 receivers for some shots we had to repeat some of the shots twice, for example, CSG # 121 was recorded when the active receivers were 1 to 240, then repeated when the active receivers were 241 to 480, both files merged together to have CSG # 121 with 480 active receivers.

Group

Src No

Active Rec No

Src Offset (m)

Rec Offset (m)

Receiver Type

1

1 – 120

1 – 240

0 – 1190

0 – 1195

40 Hz

2

121 – 180

1 – 480

1200 – 1790

0 – 2395

40 Hz for rec. 1 – 240

4.5 Hz for rec. 241 - 480

3

181 – 240

241 – 480

1800 – 2390

1200 – 2395

4.5 Hz

4

241 - 270

241 – 720

2400 – 2690

1200 – 3595

4.5 Hz

5

271 – 360

481 - 720

2700 - 3590

2400 - 3595

4.5 Hz

 

 

Borehole Location

          Borehole 2a is located at offset X = 2660 m. The log and more information about this borehole will be provided later.

 

Data Download

          Download Topography data from here (ASCII format)

Download seismic data

Data are rearranged, merged, and converted to matlab format. Data can be downloaded from the following links:

1.     All Data as one file with 360 CSGs and 720 receivers/CSG. If the receiver was not active, then a trace with all-zeros is added.

2.     Part 1. CSGs 1 to 120

3.     Part 2. CSGs 121 to 180

4.     Part 3. CSGs 181 to 240

5.     Part 4. CSGs 241 to 260

6.     Part 5. CSGs 261 to 360

 

High Resolution Data

          We recorded one data set with geophone interval = 0.5 m, shot interval = 1 m at the eastern end of the main profile. The high-res offset starts at X = 2620 m and ends at X = 2740 m. Down load this data set from the following link:

High resolution seismic profile (matlab format)