Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 21-05-2021 and time 05:51:27 (Italy) in region 2 km N Montegallo (AP)

A magnitude ML 1.5 earthquake occured in region: 2 km N Montegallo (AP), on

  • 21-05-2021 03:51:27 (UTC)
  • 21-05-2021 05:51:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8610, 13.3320 at 24 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
Montegallo AP 2 523 523
Montemonaco AP 4 604 1127
Montefortino FM 9 1178 2305
Arquata del Tronto AP 10 1178 3483
Palmiano AP 11 196 3679
Roccafluvione AP 12 2010 5689
Acquasanta Terme AP 12 2916 8605
Comunanza AP 13 3166 11771
Venarotta AP 13 2066 13837
Amandola FM 14 3629 17466
Castelsantangelo sul Nera MC 15 281 17747
Bolognola MC 17 142 17889
Force AP 17 1354 19243
Montefalcone Appennino FM 18 424 19667
Ussita MC 18 444 20111
Smerillo FM 19 365 20476
Valle Castellana TE 19 977 21453
Accumoli RI 20 667 22120
Sarnano MC 20 3264 25384

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km NW of Teramo (54892 inhabitants)
52 Km E of Foligno (57155 inhabitants)
57 Km N of L'Aquila (69753 inhabitants)
65 Km NE of Terni (111501 inhabitants)
77 Km NW of Montesilvano (53738 inhabitants)
81 Km E of Perugia (166134 inhabitants)
85 Km NW of Pescara (121014 inhabitants)
86 Km S of Ancona (100861 inhabitants)
89 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 2021-05-21
03:51:27		 42.8608 13.3315 24 2021-12-29
11:12:11		 Bollettino Sismico Italiano INGV 92830231
Reviewed
Rev100 		ML 1.5 2021-05-21
03:51:27		 42.8587 13.3322 23 2021-05-21
03:59:21		 Sala Sismica INGV-Roma 90317971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-21 03:51:27 ± 0.08
Latitude 42.8608 ± 0.0027
Longitude 13.3315 ± 0.0049
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 92830231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 450
Semi-minor axis of confidence ellipse (meter) 21
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 251
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) 66
Number of associated phases, regardless of their use for origin computation 50
Number of defining phases 47
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.71046
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 34
Type of magnitude ML
Reference to an origin 92830231
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-07-16 14:29:56

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 29
Type of magnitude ML
Reference to an origin 90317971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-21 03:59:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.NARO.HHZ. 2021-05-21T03:51:59.87 3.0 undecidable manual S 3.06 0
IV.VAGA.HHZ. 2021-05-21T03:51:52.53 3.0 negative manual Pn -0.45 0
IV.PESA.HHZ. 2021-05-21T03:51:50.27 3.0 undecidable manual P 3.64 0
IV.FAGN.HHZ. 2021-05-21T03:51:49.33 0.3 undecidable manual S 163 69.1752 102 0.27 64
IV.CING.HHZ. 2021-05-21T03:51:46.79 0.3 undecidable manual S 349 58.1973 105 0.58 61
IV.ASSB.HHZ. 2021-05-21T03:51:46.60 0.3 undecidable manual S 290 58.1973 105 0.37 63
IV.RM33.EHZ. 2021-05-21T03:51:41.88 0.3 undecidable manual S 194 40.1265 113 0.22 67
IV.GAVE.EHZ. 2021-05-21T03:51:41.89 0.6 undecidable manual S 242 40.2264 113 0.22 45
IV.T0110.HHZ. 2021-05-21T03:51:41.48 0.6 undecidable manual P 152 78.8655 101 -0.05 44
IV.MML1.HNE. 2021-05-21T03:51:41.70 0.3 undecidable manual S 314 40.4262 113 -0.04 71
IV.CESI.HHZ. 2021-05-21T03:51:41.46 0.3 undecidable manual S 295 38.1285 115 0.28 67
IV.LNSS.HHZ. 2021-05-21T03:51:41.39 0.3 undecidable manual S 220 37.1295 115 0.46 64
IV.TERO.HHZ. 2021-05-21T03:51:40.10 0.3 undecidable manual S 140 34.5432 117 -0.19 69
IV.CAMP.HHE. 2021-05-21T03:51:40.65 0.3 undecidable manual S 170 36.6411 116 -0.14 71
IV.FAGN.HHZ. 2021-05-21T03:51:39.90 0.6 undecidable manual P 163 69.1752 102 -0.16 44
IT.MTCL.HGZ. 2021-05-21T03:51:39.41 0.3 undecidable manual S 299 30.747 121 -0.01 73
IV.ASSB.HHZ. 2021-05-21T03:51:38.36 1.0 undecidable manual P 290 58.1973 105 -0.07 23
IV.SAP2.EHZ. 2021-05-21T03:51:38.79 0.3 undecidable manual S 12 26.751 125 0.27 70
IV.FDMO.HHZ. 2021-05-21T03:51:38.55 0.3 undecidable manual S 315 27.8499 124 -0.2 70
IV.CSP1.EHZ. 2021-05-21T03:51:38.73 0.3 undecidable manual S 338 27.6501 124 0.02 73
IV.T1299.HNZ. 2021-05-21T03:51:38.50 0.3 undecidable manual S 189 25.4523 127 0.26 69
IV.SMA1.EHZ. 2021-05-21T03:51:38.08 0.3 undecidable manual S 179 25.5522 127 -0.18 71
IV.CING.HHZ. 2021-05-21T03:51:38.05 0.3 undecidable manual P 349 58.1973 105 -0.37 64
IV.MF5.EHZ. 2021-05-21T03:51:37.05 0.3 undecidable manual S 36 17.4714 139 0.37 70
IV.GUMA.HHZ. 2021-05-21T03:51:37.97 0.3 undecidable manual S 1 22.3554 131 0.37 69
IV.NRCA.HHZ. 2021-05-21T03:51:36.68 0.3 undecidable manual S 260 17.9709 138 -0.07 74
IV.MC2.EHZ. 2021-05-21T03:51:36.19 0.3 undecidable manual S 296 12.876 148 0.26 71
IV.LNSS.HHZ. 2021-05-21T03:51:35.44 0.3 undecidable manual P 220 37.1295 115 0.07 70
IV.CAMP.HHE. 2021-05-21T03:51:35.52 0.6 undecidable manual P 170 36.6411 116 0.23 46
IV.RM33.EHZ. 2021-05-21T03:51:35.72 0.1 undecidable manual P 194 40.1265 113 -0.08 95
IV.MTRA.EHZ. 2021-05-21T03:51:35.78 0.3 undecidable manual S 155 12.6762 148 -0.13 73
IV.GAVE.EHZ. 2021-05-21T03:51:35.69 0.6 undecidable manual P 242 40.2264 113 -0.11 47
IV.MML1.HNE. 2021-05-21T03:51:35.52 0.3 undecidable manual P 314 40.4262 113 -0.32 67
IV.CESI.HHZ. 2021-05-21T03:51:35.27 0.1 undecidable manual P 295 38.1285 115 -0.24 91
IV.TERO.HHZ. 2021-05-21T03:51:34.81 0.1 undecidable manual P 140 34.5432 117 -0.19 93
IV.OFFI.HHZ. 2021-05-21T03:51:34.85 0.3 undecidable manual P 74 29.9478 122 0.46 67
IV.MMO1.EHZ. 2021-05-21T03:51:34.82 0.3 undecidable manual S 355 4.2957 168 -0.25 72
IT.MTCL.HGZ. 2021-05-21T03:51:34.18 0.3 undecidable manual P 299 30.747 121 -0.32 68
IV.GUMA.HHZ. 2021-05-21T03:51:33.47 0.1 negative manual P 1 22.3554 131 0.02 98
IV.T1299.HNZ. 2021-05-21T03:51:33.83 0.3 undecidable manual P 189 25.4523 127 0.01 73
IV.SMA1.EHZ. 2021-05-21T03:51:33.68 0.1 undecidable manual P 179 25.5522 127 -0.15 96
IV.SAP2.EHZ. 2021-05-21T03:51:33.88 0.6 undecidable manual P 12 26.751 125 -0.1 47
IV.FDMO.HHZ. 2021-05-21T03:51:33.80 0.1 negative manual P 315 27.8499 124 -0.31 91
IV.FEMA.HNZ. 2021-05-21T03:51:33.88 1.0 undecidable manual P 296 25.4523 127 0.06 24
IV.CSP1.EHZ. 2021-05-21T03:51:33.91 0.1 negative manual P 338 27.6501 124 -0.18 94
IV.MTRA.EHZ. 2021-05-21T03:51:32.32 0.1 undecidable manual P 155 12.6762 148 -0.15 97
IV.MC2.EHZ. 2021-05-21T03:51:32.48 0.1 negative manual P 296 12.876 148 0 100
IV.NRCA.HHZ. 2021-05-21T03:51:32.82 0.1 negative manual P 260 17.9709 138 -0.14 97
IV.MF5.EHZ. 2021-05-21T03:51:32.97 0.1 undecidable manual P 36 17.4714 139 0.05 99
IV.MMO1.EHZ. 2021-05-21T03:51:31.80 0.1 undecidable manual P 355 4.2957 168 -0.19 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:2.0 0.0005897940500000001 0.2176 AML other m 2021-05-21T03:51:36.37
IV.MTRA.HNN. ML:1.9 0.0005266727 0.1696 AML other m 2021-05-21T03:51:36.15
IV.MTRA.EHN. ML:1.9 0.00051 0.16 AML other m 2021-05-21T03:51:36.07
IV.MTRA.HNE. ML:2.0 0.0006017542499999999 0.2272 AML other m 2021-05-21T03:51:36.48
IV.NRCA.HHN. ML:1.9 0.000374 0.14 AML other m 2021-05-21T03:51:36.88
IV.NRCA.HHE. ML:1.7 0.00024780565 0.1216 AML other m 2021-05-21T03:51:38.64
IV.SMA1.EHN. ML:1.3 0.00009057121499999999 0.1408 AML other m 2021-05-21T03:51:38.40
IV.FDMO.HHN. ML:1.5 0.000135 0.18 AML other m 2021-05-21T03:51:38.93
IV.CSP1.EHN. ML:1.8 0.000263565 0.2624 AML other m 2021-05-21T03:51:39.00
IV.SMA1.EHE. ML:1.4 0.00010043718 0.2208 AML other m 2021-05-21T03:51:39.01
IV.CSP1.EHE. ML:1.8 0.00028649999999999997 0.14 AML other m 2021-05-21T03:51:39.09
IV.GUMA.HHN. ML:1.6 0.00018322654999999998 0.2208 AML other m 2021-05-21T03:51:38.26
IV.FDMO.HHE. ML:1.3 0.00007450000000000001 0.96 AML other m 2021-05-21T03:51:39.76
IV.GUMA.HHE. ML:1.7 0.00021723480000000002 0.2592 AML other m 2021-05-21T03:51:38.13
IV.TERO.HHN. ML:1.2 0.00005753878 0.08 AML other m 2021-05-21T03:51:41.02
IV.LNSS.HHN. ML:1.4 0.0000738 0.3 AML other m 2021-05-21T03:51:41.65
IV.CESI.HHE. ML:1.3 0.000060405445 0.3392 AML other m 2021-05-21T03:51:43.12
IV.CESI.HHN. ML:1.6 0.000133 0.3 AML other m 2021-05-21T03:51:42.03
IV.LNSS.HHE. ML:1.4 0.00008 0.14 AML other m 2021-05-21T03:51:42.28
IV.RM33.EHE. ML:1.5 0.00009659999999999999 0.2 AML other m 2021-05-21T03:51:42.80
IV.GAVE.EHE. ML:1.5 0.00009665 0.16 AML other m 2021-05-21T03:51:42.91
IV.GAVE.EHN. ML:1.5 0.00008319999999999999 0.36 AML other m 2021-05-21T03:51:42.74
IV.RM33.EHN. ML:1.2 0.000048549999999999994 0.96 AML other m 2021-05-21T03:51:42.51
IV.CING.HHE. ML:0.9 0.00001715 1.12 AML other m 2021-05-21T03:51:47.38
IV.CING.HHN. ML:1.0 0.0000184 1.9 AML other m 2021-05-21T03:51:47.98
IV.ASSB.HHN. ML:1.0 0.000022199999999999998 1.76 AML other m 2021-05-21T03:51:48.99
IV.ASSB.HHE. ML:1.1 0.00002447802 0.2208 AML other m 2021-05-21T03:51:48.93
IV.FAGN.HHN. ML:1.3 0.000036933745000000005 0.32 AML other m 2021-05-21T03:51:53.73
IV.FAGN.HHE. ML:1.5 0.000050549999999999995 1.02 AML other m 2021-05-21T03:51:51.41
IV.NRCA.HNN. ML:1.8 0.000335454 0.1312 AML other m 2021-05-21T03:51:36.81
IV.NRCA.HNE. ML:1.7 0.00024291355 0.1184 AML other m 2021-05-21T03:51:38.50
IV.MF5.EHE. ML:1.4 0.00013459405 0.2016 AML other m 2021-05-21T03:51:37.32
IV.MF5.EHN. ML:1.6 0.000199948095 0.24 AML other m 2021-05-21T03:51:37.44
IV.TERO.HHE. ML:1.3 0.0000650073 0.1184 AML other m 2021-05-21T03:51:41.18
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