Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 21-09-2020 and time 10:42:19 (UTC) in region 7 km SE Castelsantangelo sul Nera (MC)

A magnitude ML 1.5 earthquake occured in region: 7 km SE Castelsantangelo sul Nera (MC), on

  • 21-09-2020 10:42:19 (UTC)
  • 21-09-2020 12:42:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8610, 13.2190 at 6 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 7 281 281
Montegallo AP 10 523 804
Montemonaco AP 10 604 1408
Ussita MC 11 444 1852
Arquata del Tronto AP 12 1178 3030
Norcia PG 13 4957 7987
Visso MC 13 1107 9094
Montefortino FM 14 1178 10272
Preci PG 15 724 10996
Bolognola MC 15 142 11138
Amandola FM 18 3629 14767
Accumoli RI 19 667 15434
Acquasanta Terme AP 19 2916 18350
Acquacanina MC 19 121 18471
Comunanza AP 19 3166 21637

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km E of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
57 Km NE of Terni (111501 inhabitants)
58 Km N of L'Aquila (69753 inhabitants)
73 Km E of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
88 Km S of Ancona (100861 inhabitants)
93 Km W of Pescara (121014 inhabitants)
96 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
Bulletin
Rev1000 		ML 1.5 2020-09-21
10:42:19		 42.8607 13.2193 7 2021-02-26
14:55:56		 Bollettino Sismico Italiano INGV 83154221
Reviewed
Rev100 		ML 1.6 2020-09-21
10:42:19		 42.8632 13.2322 8 2020-09-21
10:51:08		 Sala Sismica INGV-Roma 83098181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-21 10:42:19 ± 0.12
Latitude 42.8607 ± 0.0027
Longitude 13.2193 ± 0.0049
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 83154221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 388
Semi-minor axis of confidence ellipse (meter) 127
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 122
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29228
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 83154221
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-23 08:43:32

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 83098181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-21 10:51:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CR.STON.BHZ. 2020-09-21T10:43:39.72 3.0 undecidable manual Sn 1.42 0
HL.VLS.HHZ. 2020-09-21T10:43:38.05 3.0 undecidable manual Pn -4.29 0
IV.PLAC.HHZ. 2020-09-21T10:43:23.59 3.0 undecidable manual Pg 13.83 0
XK.GIZZ.HHZ. 2020-09-21T10:43:20.56 3.0 negative manual Pg 17.83 0
IV.ZONE.HHZ. 2020-09-21T10:43:12.00 3.0 positive manual Pg 17.09 0
GU.GSCL.HHZ. 2020-09-21T10:43:11.11 3.0 undecidable manual Sn -1.47 0
IX.MNT3.HHZ.02 2020-09-21T10:43:08.64 3.0 undecidable manual Sn -2.35 0
IV.PII.HHZ. 2020-09-21T10:43:06.13 3.0 undecidable manual Sn 1.17 0
IV.MCRV.HHZ. 2020-09-21T10:42:52.84 3.0 undecidable manual Pg 13.63 0
IV.CAFI.HHZ. 2020-09-21T10:42:48.59 3.0 undecidable manual Sn 0.68 0
IX.MNT3.HHZ.02 2020-09-21T10:42:42.32 3.0 undecidable manual Pg 4.54 0
GU.GSCL.HHZ. 2020-09-21T10:42:38.17 3.0 undecidable manual Pn -0.5 0
IV.OSSC.HHZ. 2020-09-21T10:42:36.57 3.0 undecidable manual Pg 7.58 0
IV.LNSS.HNZ. 2020-09-21T10:42:31.38 0.1 undecidable manual S 207 32.1456 101 0.11 94
IV.GAVE.HNZ. 2020-09-21T10:42:31.62 0.3 undecidable manual S 235 32.4453 101 0.25 69
IV.MF5.EHN. 2020-09-21T10:42:29.18 0.1 undecidable manual S 54 24.0537 105 0.61 84
IV.CSP1.EHZ. 2020-09-21T10:42:29.01 0.3 undecidable manual S 357 25.6521 104 -0.09 72
IV.SMA1.EHE. 2020-09-21T10:42:29.35 0.6 undecidable manual S 160 27.2505 103 -0.26 46
IV.RNI2.HHZ. 2020-09-21T10:42:28.70 3.0 positive manual Pn 1.67 0
IV.GUMA.HNN. 2020-09-21T10:42:28.87 0.3 undecidable manual S 23 24.3534 105 0.23 70
IV.CERA.HHZ. 2020-09-21T10:42:27.16 3.0 negative manual Pn 0.15 0
IV.MTRA.HNZ. 2020-09-21T10:42:26.84 0.1 undecidable manual S 129 18.4704 109 0.14 96
IV.GAVE.HNZ. 2020-09-21T10:42:26.68 0.1 undecidable manual P 235 32.4453 101 0.15 93
IV.LNSS.HNZ. 2020-09-21T10:42:26.20 0.1 undecidable manual P 207 32.1456 101 -0.27 91
IV.SMA1.EHE. 2020-09-21T10:42:25.42 0.1 undecidable manual P 160 27.2505 103 -0.09 95
IV.CESI.HHE. 2020-09-21T10:42:25.68 0.3 undecidable manual P 302 30.1476 102 -0.41 67
IV.ROSPO.HHZ. 2020-09-21T10:42:25.48 3.0 undecidable manual P -4.35 0
IV.MF5.EHN. 2020-09-21T10:42:25.15 0.1 undecidable manual P 54 24.0537 105 0.24 93
IV.CSP1.EHZ. 2020-09-21T10:42:25.01 0.3 undecidable manual P 357 25.6521 104 -0.2 70
IV.GUMA.HNN. 2020-09-21T10:42:24.98 0.1 undecidable manual P 23 24.3534 105 0.03 97
IV.NRCA.HHZ. 2020-09-21T10:42:24.05 0.1 undecidable manual S 251 9.0798 126 0.28 95
IV.MC2.EHZ. 2020-09-21T10:42:23.05 0.1 undecidable manual S 336 6.1938 137 0.04 100
IV.MTRA.HNZ. 2020-09-21T10:42:23.80 0.1 undecidable manual P 129 18.4704 109 -0.03 98
IV.MMO1.EHZ. 2020-09-21T10:42:23.57 0.1 undecidable manual S 64 9.7791 124 -0.4 92
IV.NRCA.HHZ. 2020-09-21T10:42:22.08 0.1 undecidable manual P 251 9.0798 126 -0.06 99
IV.MMO1.EHZ. 2020-09-21T10:42:21.96 0.1 positive manual P 64 9.7791 124 -0.29 94
IV.MC2.EHZ. 2020-09-21T10:42:21.56 0.1 positive manual P 336 6.1938 137 -0.14 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.5 0.000505 0.4 AML other m 2020-09-21T10:42:24.41
IV.NRCA.HNE. ML:1.3 0.0003716839 0.1728 AML other m 2020-09-21T10:42:24.21
IV.NRCA.HHN. ML:1.6 0.000756 0.36 AML other m 2020-09-21T10:42:24.52
IV.NRCA.HNN. ML:1.6 0.00069129505 0.1344 AML other m 2020-09-21T10:42:24.52
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