Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 26-02-2021 and time 05:19:38 (UTC) in region 2 km SW Castelsantangelo sul Nera (MC)

A magnitude ML 0.6 earthquake occured in region: 2 km SW Castelsantangelo sul Nera (MC), on

  • 26-02-2021 05:19:38 (UTC)
  • 26-02-2021 06:19:38 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.88, 13.14 at 12 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 2 281 281
Ussita MC 7 444 725
Visso MC 7 1107 1832
Preci PG 9 724 2556
Norcia PG 11 4957 7513
Bolognola MC 14 142 7655
Montemonaco AP 15 604 8259
Montegallo AP 16 523 8782
Acquacanina MC 17 121 8903
Monte Cavallo MC 17 145 9048
Fiastra MC 17 559 9607
Montefortino FM 17 1178 10785
Arquata del Tronto AP 17 1178 11963
Sellano PG 18 1079 13042
Fiordimonte MC 18 202 13244
Pieve Torina MC 20 1458 14702
Cerreto di Spoleto PG 20 1075 15777

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
52 Km W of Teramo (54892 inhabitants)
54 Km NE of Terni (111501 inhabitants)
63 Km NW of L'Aquila (69753 inhabitants)
66 Km E of Perugia (166134 inhabitants)
87 Km SW of Ancona (100861 inhabitants)
92 Km W of Montesilvano (53738 inhabitants)
99 Km W of Pescara (121014 inhabitants)
100 Km NE of Viterbo (67173 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 0.6 2021-02-26
05:19:38		 42.88 13.15 12 2021-02-26
05:42:28		 Sala Sismica INGV-Roma 87491331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-26 05:19:38 ± 0.13
Latitude 42.88 ± 0.01
Longitude 13.15 ± 0.01
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87491331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 851
Semi-minor axis of confidence ellipse (meter) 264
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 31
Circular confidence region, given by single value of horizontal uncertainty (meter) 850
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 222
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.21404
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 87491331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-26 05:42:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MNTT.EHZ. 2021-02-26T05:19:55.44 3.0 undecidable manual S 0.17 0
IV.CESI.HHZ. 2021-02-26T05:19:46.64 0.3 undecidable manual S 305 0.214 93 -0.19 71
IV.MNTT.EHZ. 2021-02-26T05:19:46.92 3.0 negative manual P -0.24 0
IV.FDMO.HHZ. 2021-02-26T05:19:45.17 0.1 undecidable manual S 345 0.1592 96 -0.04 98
IV.MMO1.EHZ. 2021-02-26T05:19:44.28 0.1 undecidable manual S 83 0.134 102 -0.19 96
IV.CSP1.EHZ. 2021-02-26T05:19:43.26 0.1 undecidable manual P 12 0.2131 93 0.16 96
IV.CESI.HHZ. 2021-02-26T05:19:43.11 0.1 undecidable manual P 305 0.214 93 0 99
IV.FDMO.HHZ. 2021-02-26T05:19:42.23 0.1 undecidable manual P 345 0.1592 96 0.05 99
IV.MC2.EHZ. 2021-02-26T05:19:42.29 0.1 undecidable manual S 48 0.0432 151 -0.04 100
IV.MMO1.EHZ. 2021-02-26T05:19:41.81 0.1 undecidable manual P 83 0.134 102 0.06 99
IV.MC2.EHZ. 2021-02-26T05:19:40.65 0.1 undecidable manual P 48 0.0432 151 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.5 1.88E-5 1.68 AML other m 2021-02-26T05:19:47.15
IV.CESI.HHN. ML:0.6 2.27E-5 1.04 AML other m 2021-02-26T05:19:47.29
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download