Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 21-04-2024 and time 21:07:38 (UTC) in region 8 km W Accumoli (RI)

A magnitude ML 1.1 earthquake occured in region: 8 km W Accumoli (RI), on

  • 21-04-2024 21:07:38 (UTC)
  • 21-04-2024 23:07:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7280, 13.1600 at 9 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
Accumoli RI 8 667 667
Norcia PG 9 4957 5624
Cascia PG 12 3217 8841
Cittareale RI 12 482 9323
Arquata del Tronto AP 12 1178 10501
Amatrice RI 15 2657 13158
Poggiodomo PG 18 117 13275
Castelsantangelo sul Nera MC 19 281 13556
Monteleone di Spoleto PG 19 599 14155
Montegallo AP 19 523 14678
Preci PG 20 724 15402

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km SE of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
46 Km E of Terni (111501 inhabitants)
46 Km NW of L'Aquila (69753 inhabitants)
76 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
90 Km NE of Tivoli (56533 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km W of Chieti (51815 inhabitants)
93 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
Reviewed
Rev100 		ML 1.1 2024-04-21
21:07:38		 42.7283 13.1603 9 2024-04-21
23:48:02		 Sala Sismica INGV-Roma 126949281
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2024-04-21 21:07:38 ± 0.12
Latitude 42.7283 ± 0.0036
Longitude 13.1603 ± 0.0073
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 126949281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 558
Semi-minor axis of confidence ellipse (meter) 175
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 276
Circular confidence region, given by single value of horizontal uncertainty (meter) 560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 117
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.31206
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 126949281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2024-04-21 23:48:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIAM.HHZ. 2024-04-21T21:07:52.57 3.0 negative manual P -0.06 0
IV.FDMO.HHZ. 2024-04-21T21:07:50.58 0.1 undecidable manual S 350 34.6431 50 0.29 91
IV.MOMA.HHZ. 2024-04-21T21:07:50.72 3.0 undecidable manual P 0.05 0
IV.MMO1.EHZ. 2024-04-21T21:07:46.87 0.1 undecidable manual S 36 23.2545 111 0.05 98
7F.SIB1.EHN. 2024-04-21T21:07:46.04 0.1 undecidable manual S 26 20.4684 114 0.13 97
IV.MC2.EHZ. 2024-04-21T21:07:46.69 0.1 undecidable manual S 7 20.4684 114 0.8 79
IV.LNSS.HHZ. 2024-04-21T21:07:45.06 0.1 undecidable manual S 215 17.0718 118 0.23 95
IV.SMA1.EHE. 2024-04-21T21:07:45.51 0.1 undecidable manual S 127 17.9709 117 0.4 92
7F.SIB3.EHZ. 2024-04-21T21:07:45.33 0.1 undecidable manual S 29 18.5703 116 0.03 99
IV.MTRA.HNN. 2024-04-21T21:07:45.67 0.1 undecidable manual S 81 19.4694 115 0.07 98
IV.FDMO.HHZ. 2024-04-21T21:07:45.13 1.0 negative manual P 350 34.6431 50 -0.02 24
IV.NRCA.HHZ. 2024-04-21T21:07:43.39 0.1 undecidable manual S 342 12.2766 127 -0.04 100
IV.RM33.HNE. 2024-04-21T21:07:43.20 0.1 undecidable manual P 170 24.753 110 -0.21 94
7F.SIB1.EHN. 2024-04-21T21:07:42.35 0.1 undecidable manual P 26 20.4684 114 -0.27 94
IV.MC2.EHZ. 2024-04-21T21:07:42.66 0.1 undecidable manual P 7 20.4684 114 0.04 98
IV.MMO1.EHZ. 2024-04-21T21:07:42.60 0.1 undecidable manual P 36 23.2545 111 -0.54 87
IV.LNSS.HHZ. 2024-04-21T21:07:42.00 0.1 undecidable manual P 215 17.0718 118 0 100
IV.SMA1.EHE. 2024-04-21T21:07:42.29 0.1 undecidable manual P 127 17.9709 117 0.13 97
IV.MTRA.HNN. 2024-04-21T21:07:42.22 0.1 undecidable manual P 81 19.4694 115 -0.22 95
IV.NRCA.HHZ. 2024-04-21T21:07:41.06 0.1 undecidable manual P 342 12.2766 127 -0.13 98
IV.SIB2.EHZ. 2024-04-21T21:07:41.46 3.0 undecidable manual P 0
7F.SIB3.EHZ. 2024-04-21T21:07:41.83 0.1 undecidable manual P 29 18.5703 116 -0.44 91
ZO.PDN11.EHZ. 2024-04-21T21:07:40.23 0.1 undecidable manual P 332 6.993 143 -0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIAM.HHN. ML:1.1 0.0000341 0.44 AML other m 2024-04-21T21:07:59.55
IV.FIAM.HHE. ML:1.1 0.00003345 0.42 AML other m 2024-04-21T21:08:14.07
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