Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-07-2023 and time 17:24:38 (UTC) in region 6 km E Valle Castellana (TE)

A magnitude ML 1.4 earthquake occured in region: 6 km E Valle Castellana (TE), on

  • 21-07-2023 17:24:38 (UTC)
  • 21-07-2023 19:24:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7460, 13.5710 at 21 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Valle Castellana TE 6 977 977
Rocca Santa Maria TE 7 537 1514
Civitella del Tronto TE 8 5116 6630
Campli TE 10 7209 13839
Folignano AP 10 9241 23080
Torricella Sicura TE 12 2641 25721
Ascoli Piceno AP 12 49407 75128
Acquasanta Terme AP 13 2916 78044
Maltignano AP 14 2401 80445
Teramo TE 15 54892 135337
Cortino TE 15 656 135993
Sant'Egidio alla Vibrata TE 15 9811 145804
Roccafluvione AP 15 2010 147814
Venarotta AP 16 2066 149880
Ancarano TE 17 1857 151737
Castel di Lama AP 18 8634 160371
Montorio al Vomano TE 19 8218 168589
Appignano del Tronto AP 19 1785 170374
Torano Nuovo TE 19 1611 171985
Bellante TE 19 7152 179137
Palmiano AP 20 196 179333
Sant'Omero TE 20 5243 184576

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km NW of Teramo (54892 inhabitants)
46 Km NE of L'Aquila (69753 inhabitants)
54 Km W of Montesilvano (53738 inhabitants)
61 Km NW of Pescara (121014 inhabitants)
66 Km NW of Chieti (51815 inhabitants)
74 Km E of Foligno (57155 inhabitants)
78 Km E of Terni (111501 inhabitants)
97 Km S of Ancona (100861 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.4 2023-07-21
17:24:38		 42.7457 13.5712 21 2023-07-21
17:54:10		 Sala Sismica INGV-Roma 119457791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-21 17:24:38 ± 0.25
Latitude 42.7457 ± 0.0081
Longitude 13.5712 ± 0.0122
Depth (km) 21 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 119457791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1167
Semi-minor axis of confidence ellipse (meter) 271
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 231
Circular confidence region, given by single value of horizontal uncertainty (meter) 1170.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 219
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.12501
Epicentral distance of station farthest from the epicenter (degree) 0.45775
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 119457791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-07-21 17:54:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2023-07-21T17:24:54.89 0.6 undecidable manual S 310 50.8158 104 -0.44 43
IV.MC2.EHZ. 2023-07-21T17:24:52.01 0.6 undecidable manual S 301 36.1416 111 0.44 45
IV.RM33.EHZ. 2023-07-21T17:24:52.50 0.6 undecidable manual S 228 39.2274 109 0.16 47
IV.NRCA.HHZ. 2023-07-21T17:24:51.46 0.6 undecidable manual S 285 38.4282 110 -0.69 40
IV.GIGS.HHZ. 2023-07-21T17:24:50.44 0.6 undecidable manual S 180 32.4453 114 -0.23 47
IV.FDMO.HHZ. 2023-07-21T17:24:48.47 0.6 negative manual P 310 50.8158 104 0.05 47
IV.NRCA.HHZ. 2023-07-21T17:24:46.65 0.1 positive manual P 285 38.4282 110 0.07 96
IV.TERO.HHZ. 2023-07-21T17:24:46.54 0.6 undecidable manual S 169 13.875 141 -0.13 49
IV.RM33.EHZ. 2023-07-21T17:24:46.86 0.6 undecidable manual P 228 39.2274 109 0.17 47
IV.MC2.EHZ. 2023-07-21T17:24:46.41 0.3 undecidable manual P 301 36.1416 111 0.16 71
IV.GIGS.HHZ. 2023-07-21T17:24:45.73 0.6 undecidable manual P 180 32.4453 114 0.01 49
IV.TERO.HHZ. 2023-07-21T17:24:43.50 0.1 undecidable manual P 169 13.875 141 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.4 0.00007280000000000001 0.6 AML other m 2023-07-21T17:24:52.50
IV.NRCA.HHE. ML:1.2 0.00004910000000000001 0.14 AML other m 2023-07-21T17:24:53.20
IV.TERO.HHE. ML:1.6 0.0002911592 0.0512 AML other m 2023-07-21T17:24:46.64
IV.TERO.HHN. ML:-0.1 0.0000029162705 0.4992 AML other m 2023-07-21T17:24:46.32
IV.TERO.HNE. ML:1.2 0.00010634976 0.1408 AML other m 2023-07-21T17:24:46.75
IV.TERO.HNN. ML:1.6 0.00026810625 0.0768 AML other m 2023-07-21T17:24:46.63
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download