Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 12-08-2023 and time 18:56:40 (Italy) in region 4 km SE Castelsantangelo sul Nera (MC)

A magnitude ML 1.2 earthquake occured in region: 4 km SE Castelsantangelo sul Nera (MC), on

  • 12-08-2023 16:56:40 (UTC)
  • 12-08-2023 18:56:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8730, 13.1880 at 8 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
Castelsantangelo sul Nera MC 4 281 281
Ussita MC 9 444 725
Visso MC 10 1107 1832
Norcia PG 12 4957 6789
Montemonaco AP 12 604 7393
Preci PG 12 724 8117
Montegallo AP 12 523 8640
Bolognola MC 14 142 8782
Arquata del Tronto AP 14 1178 9960
Montefortino FM 15 1178 11138
Acquacanina MC 18 121 11259
Amandola FM 18 3629 14888
Fiastra MC 18 559 15447
Fiordimonte MC 20 202 15649

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Foligno (57155 inhabitants)
48 Km W of Teramo (54892 inhabitants)
56 Km NE of Terni (111501 inhabitants)
60 Km N of L'Aquila (69753 inhabitants)
70 Km E of Perugia (166134 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
88 Km W of Montesilvano (53738 inhabitants)
95 Km W of Pescara (121014 inhabitants)
99 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
Reviewed
Rev100 		ML 1.2 2023-08-12
16:56:40		 42.8732 13.1885 8 2023-08-12
17:02:56		 Sala Sismica INGV-Roma 120060781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-12 16:56:40 ± 0.08
Latitude 42.8732 ± 0.0036
Longitude 13.1885 ± 0.0086
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 120060781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 611
Semi-minor axis of confidence ellipse (meter) 319
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 260
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 60
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 21
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) 0.50182
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 20
Type of magnitude ML
Reference to an origin 120060781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-12 17:02:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2023-08-12T16:57:21.92 3.0 undecidable manual Sg 0.25 0
IV.IMOL.EHZ. 2023-08-12T16:57:16.92 3.0 negative manual Pg 5.24 0
IV.PTRJ.HHZ. 2023-08-12T16:57:04.65 3.0 undecidable manual Pn -3.42 0
IV.CSNT.HHZ. 2023-08-12T16:57:03.87 3.0 positive manual Pn -3.77 0
IV.CING.HHZ. 2023-08-12T16:56:59.62 0.3 undecidable manual S 1 55.6998 50 0.64 62
IV.RM33.EHZ. 2023-08-12T16:56:55.26 0.3 undecidable manual S 177 40.4262 50 0.36 70
IV.TERO.HHZ. 2023-08-12T16:56:55.63 0.3 undecidable manual S 129 43.8228 50 -0.16 72
IV.MML1.EHZ. 2023-08-12T16:56:52.08 0.6 undecidable manual S 327 31.9458 103 -0.19 49
IV.ATCC.EHZ. 2023-08-12T16:56:52.63 3.0 negative manual P 0.59 0
IV.CING.HHZ. 2023-08-12T16:56:51.69 0.1 undecidable manual P 1 55.6998 50 0.36 90
IV.SMA1.EHZ. 2023-08-12T16:56:51.53 0.3 undecidable manual S 156 29.4483 105 0.09 75
IV.MF5.EHZ. 2023-08-12T16:56:50.84 0.6 undecidable manual S 60 25.4523 107 0.75 42
IV.ASSB.HHZ. 2023-08-12T16:56:49.54 0.6 undecidable manual P 294 46.9197 50 -0.43 45
IV.CSP1.EHZ. 2023-08-12T16:56:49.60 0.3 undecidable manual S 3 24.2535 107 -0.11 75
IV.TERO.HHZ. 2023-08-12T16:56:48.92 0.1 undecidable manual P 129 43.8228 50 -0.56 87
IV.FDMO.HHZ. 2023-08-12T16:56:48.12 0.6 undecidable manual S 336 19.869 111 -0.15 50
IV.RM33.EHZ. 2023-08-12T16:56:48.80 0.1 undecidable manual P 177 40.4262 50 -0.17 97
IV.MML1.EHZ. 2023-08-12T16:56:47.18 0.1 undecidable manual P 327 31.9458 103 -0.28 96
IV.SMA1.EHZ. 2023-08-12T16:56:46.83 0.1 undecidable manual P 156 29.4483 105 -0.15 99
IV.MF5.EHZ. 2023-08-12T16:56:46.39 0.1 undecidable manual P 60 25.4523 107 0.19 99
IV.CSP1.EHZ. 2023-08-12T16:56:45.76 0.6 negative manual P 3 24.2535 107 -0.22 49
IV.MMO1.EHZ. 2023-08-12T16:56:45.32 0.6 undecidable manual S 75 11.5773 123 -0.38 49
IV.MNTT.EHZ. 2023-08-12T16:56:45.77 3.0 undecidable manual P 0
IV.NRCA.HHZ. 2023-08-12T16:56:44.99 0.6 undecidable manual S 234 7.4814 136 0.41 49
IV.FDMO.HHZ. 2023-08-12T16:56:44.97 0.1 undecidable manual P 336 19.869 111 -0.18 100
IV.NRCA.HHZ. 2023-08-12T16:56:43.41 0.1 positive manual P 234 7.4814 136 0.39 98
IV.MMO1.EHZ. 2023-08-12T16:56:43.63 1.0 positive manual P 75 11.5773 123 -0.03 26
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.8 0.001075 0.14 AML other m 2023-08-12T16:56:45.15
IV.NRCA.HNE. ML:1.8 0.0010495 0.16 AML other m 2023-08-12T16:56:45.16
IV.NRCA.HHN. ML:1.8 0.001265 0.66 AML other m 2023-08-12T16:56:45.06
IV.NRCA.HNN. ML:1.8 0.0010400000000000001 0.64 AML other m 2023-08-12T16:56:45.07
IV.MMO1.EHN. ML:1.4 0.0003015 1.08 AML other m 2023-08-12T16:56:45.55
IV.MMO1.EHE. ML:1.3 0.00027 0.94 AML other m 2023-08-12T16:56:46.17
IV.FDMO.HHE. ML:1.0 0.0000705 0.88 AML other m 2023-08-12T16:56:49.45
IV.CSP1.EHN. ML:1.5 0.0001895 0.98 AML other m 2023-08-12T16:56:50.15
IV.FDMO.HHN. ML:1.1 0.00009534999999999999 1.66 AML other m 2023-08-12T16:56:50.10
IV.CSP1.EHE. ML:1.3 0.0001236 0.86 AML other m 2023-08-12T16:56:51.26
IV.MML1.EHN. ML:1.0 0.00004475 0.72 AML other m 2023-08-12T16:56:52.36
IV.MML1.EHE. ML:1.0 0.00004405 0.4 AML other m 2023-08-12T16:56:53.68
IV.RM33.EHN. ML:0.9 0.0000241 0.92 AML other m 2023-08-12T16:56:55.38
IV.TERO.HHE. ML:1.1 0.0000385 0.16 AML other m 2023-08-12T16:56:55.91
IV.TERO.HHN. ML:1.2 0.00004445 1.4 AML other m 2023-08-12T16:56:56.90
IV.ASSB.HHN. ML:0.9 0.0000269 0.88 AML other m 2023-08-12T16:56:57.00
IV.ASSB.HHE. ML:0.8 0.00001865 1.58 AML other m 2023-08-12T16:56:58.96
IV.RM33.EHE. ML:0.9 0.0000237 0.54 AML other m 2023-08-12T16:56:58.77
IV.ATCC.EHN. ML:1.7 0.00011 0.06 AML other m 2023-08-12T16:57:05.44
IV.ATCC.EHE. ML:1.8 0.0001395 0.5 AML other m 2023-08-12T16:57:05.73
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