Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 23-02-2021 and time 03:09:44 (UTC) in region 4 km S Bolognola (MC)

A magnitude ML 1.1 earthquake occured in region: 4 km S Bolognola (MC), on

  • 23-02-2021 03:09:44 (UTC)
  • 23-02-2021 04:09:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9590, 13.2230 at 6 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
Bolognola MC 4 142 142
Ussita MC 7 444 586
Acquacanina MC 9 121 707
Castelsantangelo sul Nera MC 9 281 988
Montefortino FM 10 1178 2166
Fiastra MC 10 559 2725
Montemonaco AP 11 604 3329
Sarnano MC 11 3264 6593
Amandola FM 11 3629 10222
Visso MC 11 1107 11329
Fiordimonte MC 14 202 11531
Gualdo MC 15 815 12346
Comunanza AP 16 3166 15512
Montegallo AP 16 523 16035
Pievebovigliana MC 16 866 16901
Pieve Torina MC 17 1458 18359
Cessapalombo MC 17 512 18871
Preci PG 17 724 19595
San Ginesio MC 18 3498 23093
Monte Cavallo MC 18 145 23238
Smerillo FM 19 365 23603
Monte San Martino MC 19 765 24368
Montefalcone Appennino FM 20 424 24792
Penna San Giovanni MC 20 1108 25900
Camporotondo di Fiastrone MC 20 563 26463
Caldarola MC 20 1823 28286

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
52 Km NW of Teramo (54892 inhabitants)
65 Km NE of Terni (111501 inhabitants)
69 Km N of L'Aquila (69753 inhabitants)
70 Km E of Perugia (166134 inhabitants)
77 Km SW of Ancona (100861 inhabitants)
90 Km NW of Montesilvano (53738 inhabitants)
98 Km NW of Pescara (121014 inhabitants)
100 Km S of Fano (60888 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 2021-02-23
03:09:44		 42.9588 13.2232 6 2021-02-23
03:14:07		 Sala Sismica INGV-Roma 87397261
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-23 03:09:44 ± 0.2
Latitude 42.9588 ± 0.0045
Longitude 13.2232 ± 0.0049
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87397261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 448
Semi-minor axis of confidence ellipse (meter) 183
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 335
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.23742
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 87397261
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 03:14:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIAM.HHZ. 2021-02-23T03:10:08.86 3.0 undecidable manual S -0.16 0
IV.EL6.EHZ. 2021-02-23T03:09:59.18 3.0 undecidable manual S -0.06 0
IV.CESI.HHZ. 2021-02-23T03:09:53.99 0.3 undecidable manual S 281 26.3514 102 0.37 67
IV.ASSB.HHZ. 2021-02-23T03:09:52.94 3.0 undecidable manual P -0.33 0
IV.MF5.EHZ. 2021-02-23T03:09:51.90 0.3 undecidable manual S 80 19.4694 106 0.59 64
IV.GAVE.EHZ. 2021-02-23T03:09:51.97 3.0 positive manual P 0.04 0
IV.MNTT.EHZ. 2021-02-23T03:09:51.20 3.0 positive manual P 0.55 0
IV.NRCA.HHZ. 2021-02-23T03:09:50.61 0.3 undecidable manual S 213 16.4724 109 0.29 70
IV.SMA1.EHZ. 2021-02-23T03:09:50.90 3.0 positive manual P -0.52 0
IV.CESI.HHZ. 2021-02-23T03:09:49.51 0.3 undecidable manual P 281 26.3514 102 -0.16 70
IV.FDMO.HHZ. 2021-02-23T03:09:49.35 0.3 undecidable manual S 308 13.9749 112 -0.16 72
IV.CSP1.EHZ. 2021-02-23T03:09:49.80 0.3 undecidable manual S 354 14.874 111 0.02 74
IV.GUMA.HHZ. 2021-02-23T03:09:49.97 0.3 undecidable manual S 38 14.6742 111 0.24 71
IV.MMO1.EHZ. 2021-02-23T03:09:48.07 0.3 undecidable manual S 128 10.6782 118 -0.41 69
IV.MF5.EHZ. 2021-02-23T03:09:48.56 0.3 undecidable manual P 80 19.4694 106 0.23 70
IV.CSP1.EHZ. 2021-02-23T03:09:47.07 0.1 undecidable manual P 354 14.874 111 -0.38 91
IV.FEMA.HNE. 2021-02-23T03:09:47.56 0.3 undecidable manual P 272 14.0748 112 0.25 71
IV.GUMA.HHZ. 2021-02-23T03:09:47.29 0.6 positive manual P 38 14.6742 111 -0.13 48
IV.NRCA.HHZ. 2021-02-23T03:09:47.67 0.3 positive manual P 213 16.4724 109 -0.09 73
IV.FDMO.HHZ. 2021-02-23T03:09:47.03 0.6 negative manual P 308 13.9749 112 -0.26 47
IV.MC2.EHZ. 2021-02-23T03:09:47.21 0.3 undecidable manual S 208 5.994 134 0.08 74
IV.MMO1.EHZ. 2021-02-23T03:09:46.30 0.3 undecidable manual P 128 10.6782 118 -0.4 69
IV.MC2.EHZ. 2021-02-23T03:09:45.90 0.1 positive manual P 208 5.994 134 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSP1.EHE. ML:1.2 0.0001855 0.3 AML other m 2021-02-23T03:09:50.17
IV.NRCA.HHE. ML:1.3 0.00020600000000000002 0.16 AML other m 2021-02-23T03:09:50.88
IV.FDMO.HHE. ML:0.8 0.00008065 0.42 AML other m 2021-02-23T03:09:50.94
IV.CSP1.EHN. ML:1.4 0.0002615 1.18 AML other m 2021-02-23T03:09:51.18
IV.FDMO.HHN. ML:0.8 0.0000788 0.96 AML other m 2021-02-23T03:09:51.06
IV.NRCA.HHN. ML:1.4 0.0002235 0.54 AML other m 2021-02-23T03:09:52.95
IV.GUMA.HHN. ML:1.4 0.000253 1.26 AML other m 2021-02-23T03:09:53.11
IV.CESI.HHE. ML:1.0 0.0000565 0.58 AML other m 2021-02-23T03:09:54.47
IV.GUMA.HHE. ML:1.3 0.000244 0.36 AML other m 2021-02-23T03:09:55.71
IV.CESI.HHN. ML:1.0 0.0000618 0.86 AML other m 2021-02-23T03:09:55.98
IV.SMA1.EHN. ML:0.8 0.0000265 1.2 AML other m 2021-02-23T03:09:56.36
IV.SMA1.EHE. ML:1.1 0.000043450000000000006 0.48 AML other m 2021-02-23T03:10:02.70
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