Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 31-01-2021 and time 04:59:12 (Italy) in region 3 km SE San Severino Marche (MC)

A magnitude ML 1.8 earthquake occured in region: 3 km SE San Severino Marche (MC), on

  • 31-01-2021 03:59:12 (UTC)
  • 31-01-2021 04:59:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2110, 13.2090 at 22 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
San Severino Marche MC 3 12726 12726
Serrapetrona MC 4 966 13692
Belforte del Chienti MC 6 1886 15578
Tolentino MC 6 20069 35647
Caldarola MC 8 1823 37470
Camporotondo di Fiastrone MC 10 563 38033
Gagliole MC 12 620 38653
Cessapalombo MC 12 512 39165
Castelraimondo MC 12 4587 43752
Pollenza MC 13 6618 50370
Colmurano MC 13 1263 51633
Urbisaglia MC 14 2628 54261
Camerino MC 14 6974 61235
Treia MC 14 9403 70638
San Ginesio MC 14 3498 74136
Ripe San Ginesio MC 15 852 74988
Matelica MC 17 9981 84969
Loro Piceno MC 18 2401 87370
Cingoli MC 18 10352 97722
Pioraco MC 18 1134 98856
Gualdo MC 19 815 99671
Pievebovigliana MC 19 866 100537
Sant'Angelo in Pontano MC 20 1436 101973
Muccia MC 20 915 102888
Fiastra MC 20 559 103447

Municipalities with at least 50000 inhabitants

An earthquake occurred to
50 Km NE of Foligno (57155 inhabitants)
52 Km SW of Ancona (100861 inhabitants)
68 Km E of Perugia (166134 inhabitants)
72 Km S of Fano (60888 inhabitants)
73 Km NW of Teramo (54892 inhabitants)
81 Km SE of Pesaro (94582 inhabitants)
85 Km NE of Terni (111501 inhabitants)
97 Km N of L'Aquila (69753 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 1.8 2021-01-31
03:59:12		 43.2108 13.209 22 2021-07-12
16:54:59		 Bollettino Sismico Italiano INGV 87182291
Reviewed
Rev100 		ML 1.8 2021-01-31
03:59:12		 43.2143 13.2032 21 2021-01-31
04:08:43		 Sala Sismica INGV-Roma 86729701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-31 03:59:12 ± 0.08
Latitude 43.2108 ± 0.0036
Longitude 13.2090 ± 0.0049
Depth (km) 22 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87182291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 429
Semi-minor axis of confidence ellipse (meter) 102
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 305
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 37
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 55
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.05126
Epicentral distance of station farthest from the epicenter (degree) 0.65471
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 32
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 41
Type of magnitude ML
Reference to an origin 86729701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-31 04:08:43

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 41
Type of magnitude ML
Reference to an origin 87182291
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-29 13:26:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2021-01-31T03:59:29.12 0.3 undecidable manual S 247 48.3183 106 0.58 65
IV.AOI.HHE. 2021-01-31T03:59:28.93 0.6 undecidable manual S 40 49.2174 106 0.16 46
IV.ATCC.EHZ. 2021-01-31T03:59:28.87 0.6 undecidable manual S 267 46.1205 107 0.89 38
IV.NRCA.HHZ. 2021-01-31T03:59:27.24 0.6 undecidable manual S 190 42.5241 109 0.16 48
IV.ARVD.HHZ. 2021-01-31T03:59:26.32 0.6 undecidable manual S 326 38.4282 111 0.26 46
IV.MNTT.EHZ. 2021-01-31T03:59:26.35 0.3 undecidable manual S 118 35.4423 113 1.06 52
IV.MF5.EHZ. 2021-01-31T03:59:25.12 0.3 undecidable manual S 141 32.0457 116 0.65 64
IV.CESI.HHZ. 2021-01-31T03:59:25.45 0.3 undecidable manual S 227 33.6441 115 0.59 66
IV.FOSV.EHZ. 2021-01-31T03:59:25.97 0.6 undecidable manual S 285 37.3293 112 0.19 48
IV.MC2.EHZ. 2021-01-31T03:59:25.13 0.6 undecidable manual S 183 33.2445 115 0.36 47
IV.MMO1.EHZ. 2021-01-31T03:59:25.42 0.3 undecidable manual S 165 35.8419 113 0.01 74
IV.TERO.HHZ. 2021-01-31T03:59:25.21 0.3 undecidable manual P 154 72.6717 100 -0.34 65
IV.SMA1.EHZ. 2021-01-31T03:59:23.92 0.3 undecidable manual P 171 65.1903 101 -0.49 63
IV.MURB.HHZ. 2021-01-31T03:59:23.18 0.6 undecidable manual P 276 55.5999 104 0.21 46
IT.MTCL.HGZ. 2021-01-31T03:59:23.98 0.3 undecidable manual S 215 29.4483 119 0.11 74
IV.GAVE.EHZ. 2021-01-31T03:59:23.91 0.6 undecidable manual P 204 62.9925 102 -0.16 45
IV.MNTP.HNE. 2021-01-31T03:59:22.71 0.3 undecidable manual S 111 22.5552 127 0.38 70
IV.FRON.EHZ. 2021-01-31T03:59:22.49 0.6 undecidable manual P 311 51.7038 105 0.1 47
IV.FDMO.HHZ. 2021-01-31T03:59:22.12 0.1 undecidable manual S 207 21.6672 128 -0.02 100
IV.COR1.EHZ. 2021-01-31T03:59:22.01 0.6 undecidable manual P 340 49.617 106 -0.07 48
IV.MML1.HNZ. 2021-01-31T03:59:22.67 0.3 undecidable manual S 241 22.0668 128 0.46 70
IV.PCRO.HNZ. 2021-01-31T03:59:22.73 0.3 undecidable manual P 31 51.1155 105 0.43 65
IV.ASSB.HHZ. 2021-01-31T03:59:21.73 0.6 undecidable manual P 247 48.3183 106 -0.15 47
IV.SAP2.EHZ. 2021-01-31T03:59:21.78 0.3 undecidable manual S 129 19.9689 131 0 76
IV.CING.HHE. 2021-01-31T03:59:21.14 0.6 undecidable manual S 357 18.2706 134 -0.32 48
IV.AOI.HHE. 2021-01-31T03:59:21.73 0.1 undecidable manual P 40 49.2174 106 -0.28 92
IV.GUMA.HHZ. 2021-01-31T03:59:21.79 0.6 undecidable manual S 148 19.3695 132 0.13 50
IV.ATCC.EHZ. 2021-01-31T03:59:21.61 0.3 undecidable manual P 267 46.1205 107 0.05 72
IV.NRCA.HHZ. 2021-01-31T03:59:20.70 0.3 undecidable manual P 190 42.5241 109 -0.33 68
IV.ARVD.HHZ. 2021-01-31T03:59:20.25 0.3 undecidable manual P 326 38.4282 111 -0.19 71
IV.CIMA.HNN. 2021-01-31T03:59:20.74 0.3 undecidable manual P 74 38.7279 111 0.26 69
IV.CSP1.EHZ. 2021-01-31T03:59:20.53 0.3 undecidable manual S 181 13.1757 144 -0.04 76
IV.PP3.HNN. 2021-01-31T03:59:20.43 0.1 undecidable manual P 60 37.2294 112 0.16 95
IV.EL6.EHZ. 2021-01-31T03:59:20.98 0.6 undecidable manual S 327 15.7731 139 -0.01 51
IV.FOSV.EHZ. 2021-01-31T03:59:20.30 0.1 undecidable manual P 285 37.3293 112 0.01 99
IV.TRE1.HNN. 2021-01-31T03:59:20.73 0.6 undecidable manual S 37 13.9749 143 0.05 50
IV.MNTT.EHZ. 2021-01-31T03:59:20.20 0.3 undecidable manual P 118 35.4423 113 0.2 71
IV.PF6.EHZ. 2021-01-31T03:59:19.60 0.6 undecidable manual S 188 8.1807 156 -0.3 49
IT.MTCL.HGZ. 2021-01-31T03:59:19.42 0.6 undecidable manual P 215 29.4483 119 0.24 48
IV.MMO1.EHZ. 2021-01-31T03:59:19.64 0.1 undecidable manual P 165 35.8419 113 -0.43 90
IV.MF5.EHZ. 2021-01-31T03:59:19.54 0.1 negative manual P 141 32.0457 116 0.01 99
IV.MC2.EHZ. 2021-01-31T03:59:19.52 0.1 undecidable manual P 183 33.2445 115 -0.19 95
IV.CESI.HHZ. 2021-01-31T03:59:19.70 0.1 undecidable manual P 227 33.6441 115 -0.05 98
IV.MDAR.HNZ. 2021-01-31T03:59:19.50 0.6 undecidable manual S 249 5.6943 163 -0.17 50
IV.MNTP.HNE. 2021-01-31T03:59:18.24 0.6 undecidable manual P 111 22.5552 127 -0.05 50
IV.MML1.HNZ. 2021-01-31T03:59:18.18 0.3 undecidable manual P 241 22.0668 128 -0.04 75
IV.EL6.EHZ. 2021-01-31T03:59:17.33 0.1 undecidable manual P 327 15.7731 139 -0.19 99
IV.TRE1.HNN. 2021-01-31T03:59:17.06 0.3 undecidable manual P 37 13.9749 143 -0.28 73
IV.CING.HHE. 2021-01-31T03:59:17.44 0.1 undecidable manual P 357 18.2706 134 -0.35 96
IV.CSP1.EHZ. 2021-01-31T03:59:17.05 0.1 negative manual P 181 13.1757 144 -0.22 98
IV.FDMO.HHZ. 2021-01-31T03:59:17.97 0.1 negative manual P 207 21.6672 128 -0.22 97
IV.GUMA.HHZ. 2021-01-31T03:59:17.74 0.1 negative manual P 148 19.3695 132 -0.17 99
IV.SAP2.EHZ. 2021-01-31T03:59:17.81 0.3 undecidable manual P 129 19.9689 131 -0.17 74
IV.MDAR.HNZ. 2021-01-31T03:59:16.49 0.3 undecidable manual P 249 5.6943 163 -0.27 74
IV.PF6.EHZ. 2021-01-31T03:59:16.52 0.1 undecidable manual P 188 8.1807 156 -0.37 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MDAR.HNN. ML:1.8 0.00045531164999999997 0.16 AML other m 2021-01-31T03:59:19.57
IV.MDAR.HNE. ML:1.6 0.00027259215000000005 0.0704 AML other m 2021-01-31T03:59:19.80
IV.CSP1.EHN. ML:1.8 0.00036748715 0.16 AML other m 2021-01-31T03:59:20.78
IV.EL6.EHE. ML:1.9 0.000472 0.24 AML other m 2021-01-31T03:59:21.21
IV.EL6.EHN. ML:1.8 0.00041415524999999996 0.2208 AML other m 2021-01-31T03:59:21.37
IV.MF5.EHE. ML:1.6 0.00015593699999999998 0.7008 AML other m 2021-01-31T03:59:21.26
IV.GUMA.HHE. ML:1.8 0.00035222680000000003 0.3808 AML other m 2021-01-31T03:59:22.05
IV.GUMA.HNE. ML:1.9 0.00045674239999999997 0.4512 AML other m 2021-01-31T03:59:22.04
IV.FDMO.HHE. ML:1.8 0.00027937855 0.2208 AML other m 2021-01-31T03:59:22.32
IV.FDMO.HHN. ML:1.8 0.0003005 0.2 AML other m 2021-01-31T03:59:22.45
IV.CSP1.EHE. ML:1.7 0.00030436055 0.1216 AML other m 2021-01-31T03:59:22.60
IV.SAP2.EHE. ML:1.7 0.000241086 1.6992 AML other m 2021-01-31T03:59:22.00
IV.SAP2.EHN. ML:2.3 0.0011712563 1.84 AML other m 2021-01-31T03:59:22.00
IV.MF5.EHN. ML:1.6 0.00016015875000000002 0.4192 AML other m 2021-01-31T03:59:25.18
IV.CESI.HNE. ML:2.0 0.00031909779500000003 0.1792 AML other m 2021-01-31T03:59:25.62
IV.CESI.HHE. ML:2.0 0.00034599445 0.1984 AML other m 2021-01-31T03:59:25.62
IV.CESI.HNN. ML:2.0 0.00033873245 0.1216 AML other m 2021-01-31T03:59:25.67
IV.CESI.HHN. ML:2.0 0.0003908953 0.1216 AML other m 2021-01-31T03:59:25.67
IV.GUMA.HHN. ML:1.8 0.000357 0.52 AML other m 2021-01-31T03:59:25.99
IV.FOSV.EHE. ML:1.3 0.0000630496525 0.3392 AML other m 2021-01-31T03:59:26.76
IV.ARVD.HHE. ML:1.0 0.00002900678 0.24 AML other m 2021-01-31T03:59:27.36
IV.ARVD.HHN. ML:0.9 0.000027043135 0.08 AML other m 2021-01-31T03:59:27.53
IV.NRCA.HHE. ML:1.8 0.00017726399999999998 0.16 AML other m 2021-01-31T03:59:27.99
IV.NRCA.HNE. ML:1.8 0.00019357649999999997 0.1696 AML other m 2021-01-31T03:59:27.91
IV.NRCA.HHN. ML:1.8 0.00019167584999999998 0.1376 AML other m 2021-01-31T03:59:29.21
IV.ATCC.EHN. ML:1.8 0.000152 1.84 AML other m 2021-01-31T03:59:29.95
IV.FOSV.EHN. ML:1.2 0.000050213504999999997 0.2816 AML other m 2021-01-31T03:59:29.84
IV.ATCC.EHE. ML:1.6 0.00011663144999999999 0.16 AML other m 2021-01-31T03:59:29.91
IV.TERO.HNN. ML:2.2 0.00021265814999999998 0.7296 AML other m 2021-01-31T03:59:30.54
IV.ASSB.HHN. ML:1.7 0.00012671834999999999 0.0992 AML other m 2021-01-31T03:59:30.46
IV.ASSB.HHE. ML:1.8 0.00017525245 0.2784 AML other m 2021-01-31T03:59:30.67
IV.FRON.EHN. ML:1.2 0.00003300652 0.24 AML other m 2021-01-31T03:59:31.46
IV.FRON.EHE. ML:1.0 0.000022508093 0.2784 AML other m 2021-01-31T03:59:32.48
IV.MURB.HHN. ML:2.1 0.000247 0.4 AML other m 2021-01-31T03:59:32.78
IV.MURB.HHE. ML:2.1 0.00028849999999999997 0.32 AML other m 2021-01-31T03:59:32.79
IV.MURB.HNE. ML:2.2 0.00030506905 0.3904 AML other m 2021-01-31T03:59:32.80
IV.MURB.HNN. ML:1.9 0.00016290025 0.1792 AML other m 2021-01-31T03:59:33.15
IV.SMA1.EHN. ML:1.7 0.000084178705 0.32 AML other m 2021-01-31T03:59:33.59
IV.SMA1.EHE. ML:1.5 0.000060991029999999995 0.4 AML other m 2021-01-31T03:59:34.42
IV.TERO.HHE. ML:1.3 0.00003227518 0.1376 AML other m 2021-01-31T03:59:38.12
IV.TERO.HNE. ML:2.0 0.00014669004999999998 1.0304 AML other m 2021-01-31T03:59:43.41
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