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Table 5 Compressional and shear wave velocities of the LHVC

From: Petrophysical characterization of the Los Humeros geothermal field (Mexico): from outcrop to parametrization of a 3D geological model

Unit

VP dry

VP sat

VS dry

VS sat

[m s−1]

[m s−1]

[m s−1]

[m s−1]

Post-caldera group

 Pyroclastics, undifferentiated

1615/1605 (4) ± 85

Q1: 1539, Q3: 1701

CV: 5.25%

2637/2633 (4) ± 145

Q1: 2506, Q3: 2771

946/925 (4) ± 66

Q1: 897, Q3: 1016

1040/1036 (4) ± 125

Q1: 926, Q3: 1158

 Basalts

3770/3674 (38) ± 689

Q1: 3177, Q3: 4325

CV: 18.29%

5521/5573 (36) ± 866

Q1: 5046, Q3: 6009

CV: 15.69%

2216/2183 (36) ± 385

Q1: 1919, Q3: 2541

CV: 17.36%

3362/3276 (34) ± 554

Q1: 2924, Q3: 3890

CV: 16.47%

 Ash fall deposits

1938/1886 (4) ± 240

Q1: 1740, Q3: 2190

2222/2219 (4) ± 273

Q1: 1962, Q3: 2485

1286/1312 (4) ± 170

Q1: 1115, Q3: 1432

1402/1348 (4) ± 235

Q1: 1218, Q3: 1639

Caldera group

 Zaragoza ignimbrite

2311/2356 (34) ± 306

Q1: 2108, Q3: 2485

CV: 13.26%

3119/3002 (31) ± 642

Q1: 2708, Q3: 3271

CV: 20.58%

1414/1433 (32) ± 153

Q1: 1289, Q3: 1478

CV: 10.85%

1881/1777 (29) ± 390

Q1: 1642, Q3: 1964

CV: 20.75%

 Xáltipan ignimbrite total

1945/1756 (117) ± 613

Q1: 1432, Q3: 2391

CV: 31.51%

2461/2295 (81) ± 742

Q1: 2055, Q3: 2726

CV: 30.14%

1194/1075 (114) ± 379

Q1: 886, Q3: 1472

CV: 31.75%

1458/1378 (78) ± 416

Q1: 1215, Q3: 1686

CV: 28.52%

  Xáltipan ig. (unaltered)

1773/1628 (92) ± 525

Q1: 1382, Q3: 2134

CV: 29.60%

2371/2256 (68) ± 616

Q1: 2071, Q3: 2685

CV: 25.98%

1088/985 (89) ± 334

Q1: 850, Q3: 1343

CV: 30.64%

1479/1380 (71) ± 425

Q1: 1239, Q3: 1710

CV: 28.72%

  Xáltipan ig. (pumice)

2437/2466 (18) ± 482

Q1: 2012, Q3: 2934

CV: 19.76%

2080/2047 (7) ± 372

Q1: 1742, Q3: 2517

CV: 17.86%

1490/1523 (18) ± 283

Q1: 1245, Q3: 1735

CV: 18.96%

1247/1210 (7) ± 239

Q1: 982, Q3: 1468

CV: 19,16%

  Xáltipan ig. (altered, welded)

2945/3004 (7) ± 286

Q1: 2883, Q3: 3214

CV: 9.72%

3936/3959 (6) ± 794

Q1: 3325, Q3: 4697

CV: 20.16%

1766/1784 (7) ± 191

Q1: 1720, Q3: 1887

CV: 10.82%

2332/2343 (6) ± 438

Q1: 1919, Q3: 2796

CV: 18.79%

Pre-caldera group

 Cinder cones total

3260/3649 (15) ± 1089

Q1: 1673, Q3: 3979

CV: 33.40%

4195/4351 (13) ± 1057

Q1: 4045, Q3: 4996

CV: 25.18%

1946/2261 (15) ± 616

Q1: 1094, Q3: 2361

CV: 31.65%

2664/2792 (13) ± 666

Q1: 2478, Q3: 3189

CV: 24.99%

  Scoria

3880/3880 (11) ± 270

Q1: 3640, Q3: 4090

CV: 6.95%

4584/4444 (11) ± 510

Q1: 4068, Q3: 5198

CV: 11.12%

2297/2289 (11) ± 151

Q1: 2126, Q3: 2445

CV: 6.58%

2907/2852 (11) ± 330

Q1: 2590, Q3: 3202

CV: 11.35%

  Fallout deposits

1556/1532 (4) ± 88

Q1: 1487, Q3: 1648

CV: 5.66%

2058 (2)

984/975 (4) ± 96

Q1: 897, Q3: 1079

1326 (2)

 Teziutlán andesite unit total

3787/3879 (138) ± 1204

Q1: 2828, Q3: 4706

CV: 31.80%

5341/5425 (117) ± 1022

Q1: 4708, Q3: 6219

CV: 19.13%

2200/2286 (132) ± 683

Q1: 1666, Q3: 2738

CV: 31.04%

3168/3213 (114) ± 619

Q1: 2758, Q3: 3730

CV: 19.53%

  Teziutlán and. (nonporous)

4125/4384 (101) ± 1145

Q1: 3417, Q3: 4981

CV: 27.75%

5476/5556 (89) ± 1050

Q1: 4729, Q3: 6404

CV: 19.17%

2407/2561 (95) ± 639

Q1: 1969, Q3: 2850

CV: 26.55%

3259/3285 (86) ± 622

Q1: 2842, Q3: 3764

CV: 19.08%

  Teziutlán and. (porous)

2863/2972 (37) ± 826

Q1: 2056, Q3: 3667

CV: 28.86%

4908/5196 (28) ± 799

Q1: 4362, Q3: 5545

CV: 16.28%

1667/1762 (37) ± 474

Q1: 1211, Q3: 2106

CV: 28.44%

2889/3009 (28) ± 523

Q1: 2513, Q3: 3394

CV: 18.23%

 Cuyoaco andesite unit

4142/4029 (48) ± 1039

Q1: 3253, Q3: 5027

CV: 25.08%

5280/4893 (37) ± 1314

Q1: 4114, Q3: 6559

CV: 24.89%

2457/2377 (48) ± 602

Q1: 1984, Q3: 2906

CV: 24.48%

3083/2972 (37) ± 775

Q1: 2413, Q3: 3806

CV: 25.13%

Basement

 Limestone Cretaceous

5310/5298 (380) ± 1223

Q1: 4459, Q3: 6118

CV: 23.03%

7175/7171 (275) ± 1446

Q1: 6311, Q3: 8230

CV: 20.16%

3118/3058 (368) ± 731

Q1: 2615, Q3: 3535

CV: 23.44%

4271/4317 (272) ± 835

Q1: 3824, Q3: 4856

CV: 19.54%

 Chert nodules

5806/5813 (18) ± 828

Q1: 5348, Q3: 6339

CV: 14.25%

8142/8251 (15) ± 1148

Q1: 7248, Q3: 9172

CV: 14.10%

3532/3588 (18) ± 639

Q1: 3048, Q3: 3889

CV: 18.10%

4763/4849 (15) ± 718

Q1: 4092, Q3: 5361

CV: 15.07%

  Shales Cretaceous

2826/2469 (7) ± 1015

Q1: 2104, Q3: 3551

CV: 35.92%

3573/3210 (7) ± 1190

Q1: 2534, Q3: 4162

CV: 33.31%

1467/1365 (6) ± 322

Q1: 1258, Q3: 1624

CV: 21.97%

1973/2058 (6) ± 404

Q1: 1529, Q3: 2322

CV: 20.45%

 Limestone Jurassic

5057/4834 (38) ± 872

Q1: 4384, Q3: 5800

CV: 17.23%

6358/6360 (34) ± 1156

Q1: 5734, Q3: 7308

CV: 18.19%

3057/2953 (36) ± 638

Q1: 2583, Q3: 3329

CV: 20.88%

3779/3760 (32) ± 742

Q1: 3218, Q3: 4490

CV: 19.64%

 Sandstone Jurassic

2300/1959 (7) ± 1048

Q1: 1758, Q3: 2084

CV: 45.56%

3119/3150 (6) ± 401

Q1: 2778, Q3: 3472

CV: 12.85%

1380/1200 (7) ± 417

Q1: 1178, Q3: 1366

CV: 30.20%

1828/1850 (6) ± 245

Q1: 1648, Q3: 2044

CV: 13.37%

 Basaltic–andesitic dykes

4538/4461 (24) ± 999

Q1: 3975, Q3: 5150

CV: 22.02%

5842/5938 (20) ± 833

Q1: 5559, Q3: 6031

CV: 14.25%

2692/2702 (24) ± 542

Q1: 2493, Q3: 3004

CV: 20.13%

3557/3553 (20) ± 508

Q1: 3363, Q3: 3668

CV: 14.28%

 Marble

4028/3697 (85) ± 1268

Q1: 3031, Q3: 5078

CV: 31.48%

6698/6581 (67) ± 1690

Q1: 5304, Q3: 7964

CV: 25.22%

2262/2141 (84) ± 628

Q1: 1749, Q3: 2760

CV: 27.74%

3864/3826 (66) ± 1069

Q1: 2971, Q3: 4761

CV: 27.66%

 Quartz veins

3588/3683 (20) ± 752

Q1: 3143, Q3: 4222

CV: 20.96%

5481/5598 (20) ± 1658

Q1: 4186, Q3: 6377

CV: 30.26%

2120/2081 (20) ± 418

Q1: 1864, Q3: 2522

CV: 19.74%

3181/3378 (20) ± 857

Q1: 2477, Q3: 371

CV: 26.94%

 Skarn

4627/4570 (146) ± 1123

Q1: 3779, Q3: 5319

CV: 24.28%

6326/6297 (133) ± 1372

Q1: 5661, Q3: 7130

CV: 21.69%

2704/2639 (141) ± 656

Q1: 2189, Q3: 3208

CV: 24.27%

3742/3752 (130) ± 815

Q1: 3328, Q3: 4261

CV: 21.78%

 Granitoids total

3920/3815 (124) ± 1172

Q1: 2986, Q3: 4719

CV: 29.91%

5122/5176 (107) ± 1482

Q1: 3918, Q3: 6034

CV: 28.93%

2382/2303 (122) ± 732

Q1: 1806, Q3: 2765

CV: 30.74%

3052/3094 (105) ± 939

Q1: 2375, Q3: 3593

CV: 30.78%

  Granitoids (weak–moderate alteration)

4352/4302 (80) ± 1115

Q1: 3495, Q3: 5158

CV: 25.61%

5714/5653 (66) ± 1407

Q1: 4860, Q3: 6424

CV: 24.63%

2659/2556 (79) ± 700

Q1: 2195, Q3: 3173

CV: 26.32%

3420/3415 (64) ± 882

Q1: 2905, Q3: 3908

CV: 25.80%

  Granitoids (strong alteration)

3360/3279 (31) ± 684

Q1: 2954, Q3: 3728

CV: 20.36%

4514/4723 (31) ± 970

Q1: 3771, Q3: 5284

CV: 21.49%

2025/1957 (31) ± 414

Q1: 1771, Q3: 2300

CV: 20.46%

2737/2806 (31) ± 608

Q1: 2305, Q3: 3192

CV: 22.20%

  1. Arithmetic mean values in normal font, the numbers in bold represent the median, ± = standard deviation, () = number of analyzed plugs, Q1: 25% quartile, Q3: 75% quartile, VP = p-wave velocity, VS = s-wave velocity, dry or sat = analyzed under dry or saturated conditions