Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 01-05-2023 and time 17:30:03 (UTC) in region 6 km SW Acquasanta Terme (AP)

A magnitude ML 0.4 earthquake occured in region: 6 km SW Acquasanta Terme (AP), on

  • 01-05-2023 17:30:03 (UTC)
  • 01-05-2023 19:30:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7240, 13.3850 at 10 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
Acquasanta Terme AP 6 2916 2916
Arquata del Tronto AP 9 1178 4094
Valle Castellana TE 9 977 5071
Accumoli RI 12 667 5738
Rocca Santa Maria TE 12 537 6275
Amatrice RI 13 2657 8932
Montegallo AP 14 523 9455
Cortino TE 15 656 10111
Roccafluvione AP 17 2010 12121
Campotosto AQ 19 542 12663
Venarotta AP 20 2066 14729

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km W of Teramo (54892 inhabitants)
41 Km N of L'Aquila (69753 inhabitants)
61 Km E of Foligno (57155 inhabitants)
63 Km E of Terni (111501 inhabitants)
67 Km W of Montesilvano (53738 inhabitants)
74 Km W of Pescara (121014 inhabitants)
76 Km NW of Chieti (51815 inhabitants)
92 Km E of Perugia (166134 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
97 Km NE of Tivoli (56533 inhabitants)
100 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 0.4 2023-05-01
17:30:03		 42.724 13.3853 10 2023-05-01
18:00:00		 Sala Sismica INGV-Roma 116943501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-05-01 17:30:03 ± 0.11
Latitude 42.7240 ± 0.0045
Longitude 13.3853 ± 0.0098
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 116943501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 829
Semi-minor axis of confidence ellipse (meter) 123
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 256
Circular confidence region, given by single value of horizontal uncertainty (meter) 830.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 110
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.26890
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:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 116943501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-05-01 18:00:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RCAV.EHZ. 2023-05-01T17:30:24.82 3.0 undecidable manual P 2.94 0
IV.MF5.EHZ. 2023-05-01T17:30:15.16 0.3 undecidable manual S 12 29.8479 50 0.86 58
IV.RM33.EHZ. 2023-05-01T17:30:13.52 0.1 undecidable manual S 210 27.6501 50 -0.19 96
IV.NRCA.HHZ. 2023-05-01T17:30:12.74 0.3 undecidable manual S 299 25.1526 111 -0.25 71
IV.MMO1.EHZ. 2023-05-01T17:30:11.36 0.6 undecidable manual S 346 20.0688 116 0.01 50
7F.SIB2.EHN. 2023-05-01T17:30:11.14 0.3 undecidable manual S 340 19.6692 117 -0.1 74
IV.TERO.HHZ. 2023-05-01T17:30:11.25 0.3 undecidable manual S 122 21.0678 115 -0.42 69
7F.SIB3.EHN. 2023-05-01T17:30:11.04 0.3 undecidable manual S 331 19.1697 117 -0.06 75
IV.SMA1.EHE. 2023-05-01T17:30:09.45 0.1 undecidable manual S 202 11.1777 131 0.68 86
IV.RM33.EHZ. 2023-05-01T17:30:09.15 0.1 undecidable manual P 210 27.6501 50 -0.29 94
IV.MF5.EHZ. 2023-05-01T17:30:09.94 0.1 undecidable manual P 12 29.8479 50 0.16 96
IV.NRCA.HHZ. 2023-05-01T17:30:08.75 0.1 undecidable manual P 299 25.1526 111 -0.27 95
IV.TERO.HHZ. 2023-05-01T17:30:08.03 0.1 undecidable manual P 122 21.0678 115 -0.23 96
IV.SMA1.EHE. 2023-05-01T17:30:07.00 0.1 undecidable manual P 202 11.1777 131 0.42 94
IV.MMO1.EHZ. 2023-05-01T17:30:07.98 0.3 undecidable manual P 346 20.0688 116 -0.09 74
7F.SIB2.EHN. 2023-05-01T17:30:07.96 0.1 undecidable manual P 340 19.6692 117 -0.05 100
7F.SIB3.EHN. 2023-05-01T17:30:07.94 0.6 undecidable manual P 331 19.1697 117 0.01 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MMO1.EHE. ML:0.3 0.0000131357695 0.2432 AML other m 2023-05-01T17:30:11.50
IV.MMO1.EHN. ML:0.3 0.000014994153 0.1408 AML other m 2023-05-01T17:30:11.65
IV.TERO.HHE. ML:0.7 0.000033921535 1.7664 AML other m 2023-05-01T17:30:14.84
IV.TERO.HHN. ML:0.4 0.00001921285 0.8576 AML other m 2023-05-01T17:30:11.12
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