Question What geophones should I use in a refraction survey?

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Last Post by Gretchen Schmauder 3 years ago

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Gretchen Schmauder

(@gschmauder)

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Joined: 7 years ago

Posts: 122

Topic starter 01/09/2023 8:06 am [#1080]

10-14 Hz are the most common and the least expensive. Much more than 20-30 Hz and you start cutting into your signal. Less than 10 Hz and the phones become a somewhat fragile and less field-robust.

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summary{font-family:var(--display);font-weight:700;font-size:1.05rem;padding:18px 24px;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between}.gflex-product details.spec summary::-webkit-details-marker{display:none}.gflex-product details.spec summary::after{content:"▸";font-size:.85rem;color:var(--muted);transition:transform .2s}.gflex-product details.spec[open] summary::after{transform:rotate(90deg)}.gflex-product .spec-body{padding:0 24px 20px}.gflex-product .spec-body .row{display:flex;padding:10px 0;border-bottom:1px solid var(--line)}.gflex-product .spec-body .row:last-child{border-bottom:none}.gflex-product .spec-body .rk{flex:0 0 240px;font-weight:600;font-size:.9rem;color:var(--ink)}.gflex-product .spec-body .rv{flex:1;font-size:.9rem;color:var(--muted)}.gflex-product table.freq{width:100%;border-collapse:collapse;font-size:.9rem}.gflex-product table.freq th{text-align:left;font-weight:600;padding:10px 12px;border-bottom:2px solid var(--green);font-size:.85rem}.gflex-product table.freq td{padding:10px 12px;border-bottom:1px solid var(--line)}.gflex-product .ship-wrap{margin-top:40px}.gflex-product .ship-wrap h3{font-family:var(--display);font-size:1.05rem;font-weight:700;margin-bottom:14px}.gflex-product table.ship{width:100%;border-collapse:collapse;font-size:.9rem}.gflex-product table.ship th{text-align:left;font-weight:600;padding:10px 12px;border-bottom:2px solid var(--green);font-size:.85rem}.gflex-product table.ship td{padding:10px 12px;border-bottom:1px solid var(--line)}.gflex-product .dl-row{display:flex;flex-wrap:wrap;gap:14px}.gflex-product .uses{display:grid;gap:18px}.gflex-product .use{display:flex;gap:16px;align-items:flex-start}.gflex-product .use .bar{width:4px;min-height:36px;border-radius:2px;background:var(--green);flex-shrink:0;margin-top:2px}.gflex-product .use b{font-family:var(--display);font-weight:700;font-size:.95rem}.gflex-product .use span{color:var(--muted);font-size:.9rem}@media (max-width:768px){.gflex-product section{padding:52px 0}.gflex-product .page-head .wrap{padding-top:36px;padding-bottom:32px}.gflex-product .feat-grid{grid-template-columns:1fr}.gflex-product .bundle-cards{grid-template-columns:1fr}.gflex-product .spec-body .row{flex-direction:column;gap:2px}.gflex-product .spec-body .rk{flex:none;font-weight:700}.gflex-product .dl-row{flex-direction:column}.gflex-product .shared{flex-direction:column;align-items:flex-start}.gflex-product .shared .label{margin-bottom:4px}}#searchwp-form-1 .swp-input,#searchwp-form-1 .swp-select{border:0;border-bottom:1px solid;border-radius:0}.wpf-item-element{display:inline}#ancr-26211{background:#ffc107;color:#0a0a0a !important;font-size:18px !important;box-shadow:0 2px 4px -2px rgba(0,0,0,.5)}#ancr-26211 .ancr-btn-primary{background:#fff;color:#000 !important;border-radius:24px;box-shadow:0 2px 4px -2px rgba(0,0,0,.5)}#ancr-26211 .ancr-btn-secondary{background:#f9df74;color:#000 !important;border-radius:24px;box-shadow:0 2px 4px -2px rgba(0,0,0,.5)}#ancr-26211 .ancr-container{max-width:100%}#ancr-26211 .ancr-content a{color:#fff}