Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 26-07-2023 and time 15:57:35 (Italy) in region 3 km NE Accumoli (RI)

A magnitude ML 1.0 earthquake occured in region: 3 km NE Accumoli (RI), on

  • 26-07-2023 13:57:35 (UTC)
  • 26-07-2023 15:57:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7110, 13.2810 at 11 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 3 667 667
Arquata del Tronto AP 7 1178 1845
Amatrice RI 9 2657 4502
Acquasanta Terme AP 12 2916 7418
Cittareale RI 14 482 7900
Montegallo AP 15 523 8423
Norcia PG 18 4957 13380
Valle Castellana TE 18 977 14357
Campotosto AQ 19 542 14899

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km W of Teramo (54892 inhabitants)
41 Km N of L'Aquila (69753 inhabitants)
54 Km SE of Foligno (57155 inhabitants)
54 Km E of Terni (111501 inhabitants)
74 Km W of Montesilvano (53738 inhabitants)
81 Km W of Pescara (121014 inhabitants)
83 Km W of Chieti (51815 inhabitants)
85 Km SE of Perugia (166134 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km NE of Tivoli (56533 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 1.0 2023-07-26
13:57:35		 42.7113 13.2808 11 2023-07-26
14:11:53		 Sala Sismica INGV-Roma 119600021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-26 13:57:35 ± 0.1
Latitude 42.7113 ± 0.0054
Longitude 13.2808 ± 0.0098
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 119600021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 862
Semi-minor axis of confidence ellipse (meter) 99
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 243
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.28509
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 119600021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-07-26 14:11:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2023-07-26T13:57:46.16 3.0 undecidable manual P 2.48 0
IV.GAVE.HNN. 2023-07-26T13:57:46.48 0.6 undecidable manual S 266 31.6461 50 0.46 47
IV.TERO.HHZ. 2023-07-26T13:57:44.95 0.6 undecidable manual S 110 28.1496 50 -0.14 51
IV.RM33.EHZ. 2023-07-26T13:57:43.60 0.3 undecidable manual S 194 23.0547 50 -0.15 77
IV.MC2.EHZ. 2023-07-26T13:57:43.98 0.3 undecidable manual S 341 23.4543 50 0.14 77
IV.NRCA.HHZ. 2023-07-26T13:57:42.37 0.1 undecidable manual S 315 19.1697 119 -0.3 100
IV.MMO1.EHZ. 2023-07-26T13:57:42.57 0.6 undecidable manual S 10 21.1677 50 -0.67 45
IV.GAVE.HNN. 2023-07-26T13:57:41.25 0.3 undecidable manual P 266 31.6461 50 -0.13 76
IV.RM33.EHZ. 2023-07-26T13:57:40.10 1.0 undecidable manual P 194 23.0547 50 0.03 26
IV.MC2.EHZ. 2023-07-26T13:57:40.16 0.3 undecidable manual P 341 23.4543 50 0.04 79
IV.SMA1.EHZ. 2023-07-26T13:57:40.23 0.3 undecidable manual S 154 9.9789 137 0.1 79
IV.MMO1.EHZ. 2023-07-26T13:57:40.40 0.1 undecidable manual P 10 21.1677 50 0.62 91
IV.TERO.HHZ. 2023-07-26T13:57:40.70 1.0 negative manual P 110 28.1496 50 -0.15 25
IV.CAMP.HHZ. 2023-07-26T13:57:39.60 0.3 undecidable manual P 152 22.0668 50 -0.32 74
IV.NRCA.HHZ. 2023-07-26T13:57:39.41 0.3 positive manual P 315 19.1697 119 -0.04 79
IV.SMA1.EHZ. 2023-07-26T13:57:38.33 0.6 negative manual P 154 9.9789 137 0.35 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.0 0.00008645 0.14 AML other m 2023-07-26T13:57:42.52
IV.NRCA.HHE. ML:0.9 0.0000645 0.16 AML other m 2023-07-26T13:57:42.67
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