Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 23-02-2020 and time 16:34:11 (UTC) in region 8 km E Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 8 km E Norcia (PG), on

  • 23-02-2020 16:34:11 (UTC)
  • 23-02-2020 17:34:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7620, 13.1820 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
Norcia PG 8 4957 4957
Accumoli RI 9 667 5624
Arquata del Tronto AP 10 1178 6802
Cascia PG 15 3217 10019
Castelsantangelo sul Nera MC 15 281 10300
Montegallo AP 15 523 10823
Cittareale RI 16 482 11305
Amatrice RI 17 2657 13962
Preci PG 18 724 14686
Acquasanta Terme AP 19 2916 17602
Montemonaco AP 20 604 18206

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
49 Km E of Terni (111501 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km NW of Chieti (51815 inhabitants)
94 Km NE of Tivoli (56533 inhabitants)
96 Km E of Viterbo (67173 inhabitants)
99 Km S of Ancona (100861 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 1.0 2020-02-23
16:34:11		 42.7618 13.1822 8 2020-02-23
16:48:37		 Sala Sismica INGV-Roma 76758791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-02-23 16:34:11 ± 0.06
Latitude 42.7618 ± 0.0027
Longitude 13.1822 ± 0.0049
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 76758791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 408
Semi-minor axis of confidence ellipse (meter) 272
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 293
Circular confidence region, given by single value of horizontal uncertainty (meter) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 133
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30397
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 76758791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-02-23 16:48:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BSSO.HHZ. 2020-02-23T16:34:51.40 3.0 undecidable manual S -0.58 0
IV.RNI2.HHZ. 2020-02-23T16:34:43.15 3.0 undecidable manual S -0.27 0
IV.MF5.EHZ. 2020-02-23T16:34:23.87 0.3 undecidable manual S 42 33.744 104 0.22 91
IV.RM33.HNZ. 2020-02-23T16:34:21.71 0.6 undecidable manual S 175 28.1496 106 -0.09 65
IV.GAVE.EHZ. 2020-02-23T16:34:20.44 0.3 undecidable manual S 252 24.753 109 -0.21 95
IV.LNSS.HHZ. 2020-02-23T16:34:19.73 0.3 undecidable manual S 213 21.0678 111 0.26 94
IV.RCAV.EHZ. 2020-02-23T16:34:19.30 3.0 undecidable manual P 0.67 0
IV.MC2.EHZ. 2020-02-23T16:34:18.21 0.3 undecidable manual S 2 16.5723 117 0.17 98
IV.MF5.EHZ. 2020-02-23T16:34:18.33 0.6 undecidable manual P 42 33.744 104 -0.23 63
IV.MMO1.EHZ. 2020-02-23T16:34:18.78 0.3 undecidable manual S 38 19.2696 113 -0.1 97
IV.RM33.HNZ. 2020-02-23T16:34:17.59 1.0 undecidable manual P 175 28.1496 106 0.1 32
IV.LNSS.HHZ. 2020-02-23T16:34:16.23 0.6 undecidable manual P 213 21.0678 111 0.08 65
IV.NRCA.HHZ. 2020-02-23T16:34:16.03 0.3 undecidable manual S 325 9.6792 131 0 100
IV.GAVE.EHZ. 2020-02-23T16:34:16.72 0.3 undecidable manual P 252 24.753 109 -0.11 98
IV.MMO1.EHZ. 2020-02-23T16:34:15.64 0.3 undecidable manual P 38 19.2696 113 -0.17 97
IV.MC2.EHZ. 2020-02-23T16:34:15.31 0.3 undecidable manual P 2 16.5723 117 -0.01 100
IV.NRCA.HHZ. 2020-02-23T16:34:14.29 0.3 undecidable manual P 325 9.6792 131 0.13 99
IV.TERO.HHZ. 2020-02-23T16:34:13.95 3.0 undecidable manual P -0.25 0
IV.FIAM.HHZ. 2020-02-23T16:34:09.02 3.0 negative manual P -0.89 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.1 0.0001704617 0.128 AML other m 2020-02-23T16:34:16.24
IV.NRCA.HHN. ML:1.0 0.000148927 0.128 AML other m 2020-02-23T16:34:16.20
IV.NRCA.HNE. ML:1.1 0.00019401145 0.128 AML other m 2020-02-23T16:34:16.24
IV.NRCA.HNN. ML:1.0 0.000134457915 0.128 AML other m 2020-02-23T16:34:16.20
IV.GAVE.EHE. ML:0.8 0.000033752549999999996 0.1024 AML other m 2020-02-23T16:34:21.15
IV.GAVE.EHN. ML:0.9 0.00004327217 0.1792 AML other m 2020-02-23T16:34:21.16
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