Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 11-04-2023 and time 08:01:45 (Italy) in region 4 km W Rocca Santa Maria (TE)

A magnitude ML 1.1 earthquake occured in region: 4 km W Rocca Santa Maria (TE), on

  • 11-04-2023 06:01:45 (UTC)
  • 11-04-2023 08:01:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6980, 13.4790 at 18 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
Rocca Santa Maria TE 4 537 537
Valle Castellana TE 5 977 1514
Cortino TE 9 656 2170
Acquasanta Terme AP 10 2916 5086
Torricella Sicura TE 15 2641 7727
Crognaleto TE 17 1297 9024
Fano Adriano TE 17 296 9320
Arquata del Tronto AP 17 1178 10498
Campli TE 17 7209 17707
Amatrice RI 17 2657 20364
Civitella del Tronto TE 17 5116 25480
Montorio al Vomano TE 18 8218 33698
Campotosto AQ 18 542 34240
Roccafluvione AP 18 2010 36250
Folignano AP 19 9241 45491
Accumoli RI 19 667 46158
Teramo TE 19 54892 101050
Ascoli Piceno AP 19 49407 150457

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km W of Teramo (54892 inhabitants)
39 Km N of L'Aquila (69753 inhabitants)
59 Km W of Montesilvano (53738 inhabitants)
66 Km W of Pescara (121014 inhabitants)
68 Km NW of Chieti (51815 inhabitants)
69 Km E of Foligno (57155 inhabitants)
70 Km E of Terni (111501 inhabitants)
99 Km NE of Tivoli (56533 inhabitants)
99 Km NE of Guidonia Montecelio (88673 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 2023-04-11
06:01:45		 42.698 13.4793 18 2023-04-11
06:19:19		 Sala Sismica INGV-Roma 116269751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-11 06:01:45 ± 0.11
Latitude 42.6980 ± 0.0036
Longitude 13.4793 ± 0.0073
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 116269751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 472
Semi-minor axis of confidence ellipse (meter) 454
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 52
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 167
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30037
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.5
Num. used stations 8
Type of magnitude ML
Reference to an origin 116269751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-11 06:19:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SGG.HHZ. 2023-04-11T06:02:37.24 3.0 undecidable manual S 1.29 0
IV.IMOL.HNZ. 2023-04-11T06:02:22.59 3.0 negative manual Pn 0.67 0
IV.RCAV.EHZ. 2023-04-11T06:02:04.41 3.0 undecidable manual P -0.75 0
IV.NRCA.HHZ. 2023-04-11T06:01:56.56 0.6 undecidable manual S 297 33.3444 107 -0.15 49
IV.RM33.EHZ. 2023-04-11T06:01:56.16 0.6 undecidable manual S 226 30.1476 110 0.26 48
7F.SIB1.EHN. 2023-04-11T06:01:55.42 0.6 undecidable manual S 322 27.6501 112 0.13 49
IV.GIGS.HHZ. 2023-04-11T06:01:55.24 0.6 undecidable manual S 164 28.2495 111 -0.18 49
7F.SIB3.EHZ. 2023-04-11T06:01:54.81 0.6 undecidable manual S 319 26.0517 114 -0.07 50
IV.RM33.EHZ. 2023-04-11T06:01:51.42 0.6 negative manual P 226 30.1476 110 0.09 49
IV.TERO.HHZ. 2023-04-11T06:01:51.97 0.6 undecidable manual S 129 13.1757 136 -0.07 52
IV.NRCA.HHZ. 2023-04-11T06:01:51.72 0.1 negative manual P 297 33.3444 107 -0.08 99
IV.GIGS.HHZ. 2023-04-11T06:01:50.93 1.0 undecidable manual P 164 28.2495 111 -0.12 25
7F.SIB3.EHZ. 2023-04-11T06:01:50.71 0.6 undecidable manual P 319 26.0517 114 -0.03 51
7F.SIB1.EHN. 2023-04-11T06:01:50.99 0.6 undecidable manual P 322 27.6501 112 0.01 50
IV.TERO.HHZ. 2023-04-11T06:01:49.21 0.1 undecidable manual P 129 13.1757 136 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RCAV.EHE. ML:2.2 0.0001325 0.98 AML other m 2023-04-11T06:02:08.32
IV.RCAV.EHN. ML:2.2 0.0001278 0.12 AML other m 2023-04-11T06:02:09.37
IV.TERO.HHE. ML:1.1 0.00008866048500000001 0.32 AML other m 2023-04-11T06:01:48.23
IV.TERO.HHN. ML:1.0 0.00007798987000000001 0.08 AML other m 2023-04-11T06:01:52.11
IV.TERO.HNE. ML:1.0 0.00007023807999999999 0.2208 AML other m 2023-04-11T06:01:52.39
IV.TERO.HNN. ML:1.4 0.000206507895 0.9984 AML other m 2023-04-11T06:01:51.73
IV.GIGS.HHE. ML:0.3 0.000012053870500000001 1.2992 AML other m 2023-04-11T06:02:03.42
IV.GIGS.HHN. ML:0.3 0.000010065519 1.0016 AML other m 2023-04-11T06:02:01.08
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