Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 26-04-2023 and time 17:23:52 (Italy) in region 8 km SE Castelsantangelo sul Nera (MC)

A magnitude ML 1.0 earthquake occured in region: 8 km SE Castelsantangelo sul Nera (MC), on

  • 26-04-2023 15:23:52 (UTC)
  • 26-04-2023 17:23:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8510, 13.2290 at 4 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.

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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
Castelsantangelo sul Nera MC 8 281 281
Montegallo AP 9 523 804
Montemonaco AP 10 604 1408
Arquata del Tronto AP 10 1178 2586
Ussita MC 13 444 3030
Norcia PG 13 4957 7987
Montefortino FM 14 1178 9165
Visso MC 15 1107 10272
Preci PG 16 724 10996
Bolognola MC 16 142 11138
Acquasanta Terme AP 17 2916 14054
Accumoli RI 17 667 14721
Amandola FM 18 3629 18350
Comunanza AP 19 3166 21516
Palmiano AP 20 196 21712

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
44 Km E of Foligno (57155 inhabitants)
57 Km N of L'Aquila (69753 inhabitants)
57 Km NE of Terni (111501 inhabitants)
74 Km E of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
88 Km S of Ancona (100861 inhabitants)
91 Km W of Pescara (121014 inhabitants)
95 Km NW of Chieti (51815 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 1.0 2023-04-26
15:23:52		 42.8513 13.2288 5 2024-03-01
17:18:10		 Bollettino Sismico Italiano INGV 117739171
Reviewed
Rev100 		ML 1.2 2023-04-26
15:23:52		 42.8602 13.227 6 2023-04-26
15:49:47		 Sala Sismica INGV-Roma 116773061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-26 15:23:52 ± 0.1
Latitude 42.8513 ± 0.0027
Longitude 13.2288 ± 0.0049
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117739171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 365
Semi-minor axis of confidence ellipse (meter) 189
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 313
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 104
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.32286
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 117739171
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-05-26 10:39:10

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 116773061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-26 15:49:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MML1.EHZ. 2023-04-26T15:25:05.30 0.6 undecidable manual S 324 35.8419 97 5.981 0
IV.PF6.EHN. 2023-04-26T15:24:04.00 0.6 undecidable manual S 355 31.9458 98 -0.16 46
IV.CESI.HHZ. 2023-04-26T15:24:04.10 0.3 undecidable manual S 303 31.3464 98 0.13 70
IV.LNSS.HNZ. 2023-04-26T15:24:04.00 0.6 undecidable manual S 209 31.5462 98 -0.04 47
IV.SMA1.EHZ. 2023-04-26T15:24:02.40 0.6 undecidable manual S 160 25.9518 100 0.27 46
IV.GUMA.HHZ. 2023-04-26T15:24:02.50 0.3 undecidable manual S 20 24.9528 100 0.71 60
IV.CSP1.EHZ. 2023-04-26T15:24:02.30 0.3 undecidable manual S 356 26.751 99 -0.09 71
IV.MML1.EHZ. 2023-04-26T15:24:00.03 0.6 undecidable manual P 324 35.8419 97 -0.17 46
IV.LNSS.HNZ. 2023-04-26T15:23:59.14 0.3 undecidable manual P 209 31.5462 98 -0.22 68
IV.MF5.EHZ. 2023-04-26T15:23:59.51 3.0 undecidable manual P 0
IV.PF6.EHN. 2023-04-26T15:23:59.04 0.6 undecidable manual P 355 31.9458 98 -0.39 44
IV.CESI.HHZ. 2023-04-26T15:23:59.27 0.3 undecidable manual P 303 31.3464 98 -0.05 71
IV.GUMA.HHZ. 2023-04-26T15:23:58.23 0.3 undecidable manual P 20 24.9528 100 0.17 70
IV.SMA1.EHZ. 2023-04-26T15:23:58.15 0.3 undecidable manual P 160 25.9518 100 -0.11 71
IV.CSP1.EHZ. 2023-04-26T15:23:58.00 0.3 undecidable manual P 356 26.751 99 -0.41 66
IV.NRCA.HHZ. 2023-04-26T15:23:56.80 0.3 undecidable manual S 258 9.4794 115 0.17 72
IV.MMO1.EHZ. 2023-04-26T15:23:56.70 0.3 undecidable manual S 56 9.5793 115 0.05 74
7F.SIB2.EHE. 2023-04-26T15:23:56.00 0.3 undecidable manual S 54 7.4814 121 -0.01 74
IV.NRCA.HHZ. 2023-04-26T15:23:55.25 0.1 undecidable manual P 258 9.4794 115 0.17 96
IV.MMO1.EHZ. 2023-04-26T15:23:55.21 0.1 positive manual P 56 9.5793 115 0.12 97
7F.SIB3.EHN. 2023-04-26T15:23:54.22 0.1 positive manual P 52 4.2957 136 0 100
7F.SIB3.EHN. 2023-04-26T15:23:54.90 0.1 undecidable manual S 52 4.2957 136 -0.22 96
7F.SIB2.EHE. 2023-04-26T15:23:54.71 0.1 undecidable manual P 54 7.4814 121 -0.02 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.6 0.0007465 0.16 AML other m 2023-04-26T15:23:57.17
IV.MMO1.EHE. ML:1.1 0.00023050000000000002 0.16 AML other m 2023-04-26T15:23:57.93
IV.NRCA.HHN. ML:1.4 0.000528 0.1 AML other m 2023-04-26T15:23:58.22
IV.MMO1.EHN. ML:0.9 0.00014472671 0.1664 AML other m 2023-04-26T15:23:57.91
IV.GUMA.HHE. ML:1.5 0.00018449999999999999 0.54 AML other m 2023-04-26T15:24:02.71
IV.GUMA.HHN. ML:1.3 0.00011929999999999999 0.52 AML other m 2023-04-26T15:24:03.66
IV.CSP1.EHE. ML:1.1 0.00007828191500000001 2.2784 AML other m 2023-04-26T15:24:03.05
IV.CSP1.EHN. ML:1.2 0.000085756095 1.0624 AML other m 2023-04-26T15:24:04.45
IV.SMA1.EHE. ML:0.8 0.000035161615 7.7824 AML other m 2023-04-26T15:24:02.93
IV.SMA1.EHN. ML:0.5 0.000022083695 1.2032 AML other m 2023-04-26T15:24:03.78
IV.CESI.HHN. ML:0.9 0.00004032461 0.2816 AML other m 2023-04-26T15:24:05.22
IV.CESI.HHE. ML:0.7 0.000026317714999999998 0.2432 AML other m 2023-04-26T15:24:07.01
IV.MML1.EHE. ML:0.6 0.0000128310105 0.256 AML other m 2023-04-26T15:24:11.32
IV.MML1.EHN. ML:0.8 0.00002273244 0.1664 AML other m 2023-04-26T15:24:07.13
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