Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 01-04-2023 and time 21:19:31 (UTC) in region 3 km SW Amatrice (RI)

A magnitude ML 0.4 earthquake occured in region: 3 km SW Amatrice (RI), on

  • 01-04-2023 21:19:31 (UTC)
  • 01-04-2023 23:19:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6120, 13.2640 at 15 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Amatrice RI 3 2657 2657
Cittareale RI 9 482 3139
Accumoli RI 10 667 3806
Montereale AQ 10 2581 6387
Capitignano AQ 11 665 7052
Campotosto AQ 11 542 7594
Borbona RI 15 617 8211
Posta RI 17 694 8905
Cagnano Amiterno AQ 17 1369 10274
Barete AQ 18 737 11011
Arquata del Tronto AP 18 1178 12189
Crognaleto TE 19 1297 13486
Pizzoli AQ 20 4326 17812

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NW of L'Aquila (69753 inhabitants)
37 Km W of Teramo (54892 inhabitants)
51 Km E of Terni (111501 inhabitants)
60 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
80 Km W of Chieti (51815 inhabitants)
80 Km W of Pescara (121014 inhabitants)
81 Km NE of Guidonia Montecelio (88673 inhabitants)
82 Km NE of Tivoli (56533 inhabitants)
90 Km SE of Perugia (166134 inhabitants)
97 Km E of Viterbo (67173 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
Bulletin
Rev1000 		ML 0.4 2023-04-01
21:19:31		 42.6115 13.264 15 2024-03-01
17:18:04		 Bollettino Sismico Italiano INGV 116611831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-01 21:19:31 ± 0.14
Latitude 42.6115 ± 0.0045
Longitude 13.2640 ± 0.0073
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 116611831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 577
Semi-minor axis of confidence ellipse (meter) 525
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 262
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29138
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 116611831
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-04-22 13:28:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OT.CGL1.HHZ. 2023-04-01T21:21:01.03 3.0 undecidable manual Sg 5.51 0
1J.FX12.HHZ.00 2023-04-01T21:20:28.58 3.0 negative manual Pn -0.09 0
IV.CADC.HNZ. 2023-04-01T21:20:19.30 3.0 undecidable manual Pn 0 0
IX.COL3.HHZ.02 2023-04-01T21:19:58.43 3.0 positive manual Pg 2.07 0
7F.SIB1.EHE. 2023-04-01T21:19:42.68 0.6 undecidable manual S 1 31.4463 102 0.38 45
IV.MMO1.EHN. 2023-04-01T21:19:42.56 0.6 undecidable manual S 9 32.3454 101 0.02 48
IV.NRCA.HHZ. 2023-04-01T21:19:41.07 0.6 undecidable manual S 334 27.4503 104 -0.21 47
IT.MCLF.HNZ. 2023-04-01T21:19:39.60 3.0 undecidable manual P -3.66 0
IV.LNSS.HNZ. 2023-04-01T21:19:39.20 0.6 undecidable manual S 267 18.2706 117 0.23 48
IV.RM33.EHZ. 2023-04-01T21:19:37.47 0.3 undecidable manual S 200 12.0768 132 -0.13 73
IV.MMO1.EHN. 2023-04-01T21:19:37.70 0.1 undecidable manual P 9 32.3454 101 -0.11 95
7F.SIB1.EHE. 2023-04-01T21:19:37.58 0.3 undecidable manual P 1 31.4463 102 -0.1 72
IV.SMA1.EHZ. 2023-04-01T21:19:36.67 0.6 undecidable manual S 70 6.1938 153 0.04 50
IV.NRCA.HHZ. 2023-04-01T21:19:36.96 0.1 undecidable manual P 334 27.4503 104 -0.12 95
IV.LNSS.HNZ. 2023-04-01T21:19:35.80 0.1 undecidable manual P 267 18.2706 117 0.05 99
IV.SMA1.EHZ. 2023-04-01T21:19:34.46 0.1 undecidable manual P 70 6.1938 153 0.06 100
IV.RM33.EHZ. 2023-04-01T21:19:34.99 0.1 undecidable manual P 200 12.0768 132 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.1 0.0000637 0.16 AML other m 2023-04-01T21:19:41.34
IV.NRCA.HHN. ML:0.5 0.0000166515595 0.1152 AML other m 2023-04-01T21:19:41.32
IV.SMA1.EHN. ML:0.1 0.000016584104499999998 0.64 AML other m 2023-04-01T21:19:36.98
IV.SMA1.EHE. ML:0.4 0.000025267815 1.8944 AML other m 2023-04-01T21:19:37.23
IV.RM33.EHE. ML:0.4 0.0000226927705 0.1152 AML other m 2023-04-01T21:19:37.66
IV.RM33.EHN. ML:0.4 0.000023214125 0.2048 AML other m 2023-04-01T21:19:37.70
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