Table 1 Recurrence interval calculation for currently active FWB seismic sources.

Fault dimensions were derived from the SMU earthquake catalog and detailed studies (19, 32). Seismic moment for each sequence was calculated using NEIC catalog local magnitudes (Mb_lg) (see table S1). Note that fault areas allow for larger maximum magnitudes than those recorded by the current seismic sequences (98). Larger magnitudes would translate into larger slip/sequence and therefore into longer return intervals for each seismic sequence. Therefore, by assuming that current seismic sequences are representative of past slip occurrences, our estimates for return times can be considered minimum values.

SequenceStrike of
fault
Dip of
fault
Along-strike
extent (km)
Down-dip
extent (km)
Faulted
area (km2)
Moment of
sequence
(dynes × cm)
Fault
displacement in
sequence (cm)
Maximum
number of
sequences
Minimum
recurrence
interval (years)
Azle225703.54.314.92.11 × 10220.39380478,866
Irving39683.54.315.11.49 × 10220.28545455,003
Venus220565.52.413.31.18 × 10220.25606849,440