Earthquake with magnitude of ML 0.5 on date 21-09-2021 and time 01:50:41 (Italy) in region 2 km N Castelsantangelo sul Nera (MC)

A magnitude ML 0.5 earthquake occured in region: 2 km N Castelsantangelo sul Nera (MC), on

  • 20-09-2021 23:50:41 (UTC)
  • 21-09-2021 01:50:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.918, 13.156 at 15 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.

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 3 281 281
Ussita MC 3 444 725
Visso MC 6 1107 1832
Preci PG 10 724 2556
Bolognola MC 10 142 2698
Acquacanina MC 13 121 2819
Fiastra MC 13 559 3378
Montemonaco AP 14 604 3982
Fiordimonte MC 14 202 4184
Norcia PG 15 4957 9141
Monte Cavallo MC 15 145 9286
Montefortino FM 15 1178 10464
Pieve Torina MC 17 1458 11922
Montegallo AP 17 523 12445
Pievebovigliana MC 17 866 13311
Sarnano MC 18 3264 16575
Amandola FM 18 3629 20204
Sellano PG 19 1079 21283
Arquata del Tronto AP 20 1178 22461

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
53 Km NW of Teramo (54892 inhabitants)
57 Km NE of Terni (111501 inhabitants)
66 Km E of Perugia (166134 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
93 Km W of Montesilvano (53738 inhabitants)
100 Km NW of Pescara (121014 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.5 2021-09-20
23:50:41
42.9177 13.1558 15 2021-09-21
00:08:38
Sala Sismica INGV-Roma 95678331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-20 23:50:41 ± 0.18
Latitude 42.9177 ± 0.0072
Longitude 13.1558 ± 0.0074
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95678331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 628
Semi-minor axis of confidence ellipse (meter) 487
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 34
Circular confidence region, given by single value of horizontal uncertainty (meter) 630
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 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.02518
Epicentral distance of station farthest from the epicenter (degree) 0.23292
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 95678331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-21 00:08:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MF5.EHZ. 2021-09-20T23:50:51.97 0.3 undecidable manual S 72 0.2329 106 0.5 66
IV.CSP1.EHZ. 2021-09-20T23:50:49.82 0.3 undecidable manual S 12 0.1781 114 -0.11 74
IT.MTCL.HGE. 2021-09-20T23:50:49.09 0.3 undecidable manual S 304 0.1376 124 0.21 72
IV.MMO1.EHZ. 2021-09-20T23:50:48.26 0.3 undecidable manual S 98 0.1268 127 -0.36 70
IV.FDMO.HHZ. 2021-09-20T23:50:48.52 0.3 undecidable manual S 337 0.1286 126 -0.16 74
IV.MC2.EHZ. 2021-09-20T23:50:47.19 0.3 undecidable manual S 104 0.0252 167 0.24 73
IV.NRCA.HHE. 2021-09-20T23:50:47.71 0.3 undecidable manual S 200 0.089 139 -0.1 74
IV.MF5.EHZ. 2021-09-20T23:50:47.57 0.1 undecidable manual P 72 0.2329 106 0.13 96
IT.MTCL.HGE. 2021-09-20T23:50:46.00 0.1 undecidable manual P 304 0.1376 124 0.05 99
IV.CSP1.EHZ. 2021-09-20T23:50:46.43 0.1 undecidable manual P 12 0.1781 114 -0.13 98
IV.MMO1.EHZ. 2021-09-20T23:50:45.54 0.1 undecidable manual P 98 0.1268 127 -0.26 95
IV.NRCA.HHE. 2021-09-20T23:50:45.29 0.1 undecidable manual P 200 0.089 139 -0.04 100
IV.FDMO.HHZ. 2021-09-20T23:50:45.77 0.1 undecidable manual P 337 0.1286 126 -0.06 100
IV.MC2.EHZ. 2021-09-20T23:50:44.95 0.1 undecidable manual P 104 0.0252 167 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:0.3 1.255042E-5 0.1024 AML other m 2021-09-20T23:50:49.09
IV.FDMO.HHN. ML:0.3 1.7264701E-5 0.1536 AML other m 2021-09-20T23:50:48.88
IV.CSP1.EHE. ML:0.8 3.7662205E-5 0.0896 AML other m 2021-09-20T23:50:50.27
IV.CSP1.EHN. ML:0.7 2.87762055E-5 0 AML other m 2021-09-20T23:50:50.08
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