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Bray & Macedo (2019, corrected 2023) - shallow-crustal events

Dn_BM19.Rd

Multi-equation structure per BM23 (Soil Dynamics and Earthquake Engineering 168, 107835, DOI 10.1016/j.soildyn.2023.107835): Eq (10): ordinary motions (default; see pulse) Eq (6): D100 max-component pulse equation Eq (8): D50 median-component pulse equation with a sub-regime split at PGV = 150 cm/s within Eqs (6) and (8).

Usage

Dn_BM19(ky, Ts, Sa, PGA, PGV, Mw = 6.5, NFC = "D100", pulse = FALSE)

Arguments

ky

Yield acceleration (g).

Ts

Fundamental period (s).

Sa

Spectral acceleration at 1.3 * Ts (g).

PGA

Peak ground acceleration (g).

PGV

Peak ground velocity (cm/s).

Mw

Moment magnitude (default 6.5).

NFC

Near-fault component: "D100" (default; max-component, slope within 45 deg of fault-normal) or "D50" (median-component, other orientations). Used only when pulse = TRUE.

pulse

logical. Near-fault forward-directivity pulse motion (a property of the ground-motion record/scenario declared by the analyst, per Bray & Macedo 2019/2023 and the authors' spreadsheet). Default FALSE = ordinary-motion equation for all draws. When TRUE, the published pulse equations apply with their PGV sub-regime split at 150 cm/s. (Versions <= 1.2.0 switched automatically at PGV > 115 cm/s; that surrogate rule is retired.)

Value

data.table(muLnD, sdLnD, ID = "BM19")

Examples

Dn_BM19(ky = 0.1, Ts = 0.3, Sa = 0.8, PGA = 0.5, PGV = 80, Mw = 7.0)
#>       muLnD sdLnD     ID
#>       <num> <num> <char>
#> 1: 3.124364  0.72   BM19