Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 30-04-2021 and time 18:52:15 (Italy) in region 6 km N Grassano (MT)

A magnitude ML 1.8 earthquake occured in region: 6 km N Grassano (MT), on

  • 30-04-2021 16:52:15 (UTC)
  • 30-04-2021 18:52:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.6840, 16.2670 at 19 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
Grassano MT 6 5189 5189
Irsina MT 7 4960 10149
Calciano MT 13 777 10926
Tricarico MT 13 5388 16314
Grottole MT 13 2208 18522
Garaguso MT 15 1073 19595
San Chirico Nuovo PZ 16 1368 20963
Oliveto Lucano MT 18 450 21413
Salandra MT 18 2829 24242
Gravina in Puglia BA 20 43872 68114

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km W of Matera (60436 inhabitants)
29 Km SW of Altamura (70396 inhabitants)
39 Km E of Potenza (67122 inhabitants)
60 Km SW of Bitonto (55540 inhabitants)
61 Km S of Andria (100440 inhabitants)
64 Km SW of Molfetta (59874 inhabitants)
65 Km SW of Bisceglie (55422 inhabitants)
67 Km S of Trani (56217 inhabitants)
71 Km SW of Bari (326344 inhabitants)
71 Km S of Barletta (94814 inhabitants)
72 Km SE of Cerignola (58396 inhabitants)
85 Km W of Taranto (201100 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 2021-04-30
16:52:15		 40.6843 16.2675 19 2021-07-12
16:55:12		 Bollettino Sismico Italiano INGV 90444281
Reviewed
Rev100 		ML 1.7 2021-04-30
16:52:14		 40.6942 16.2588 5 2021-04-30
17:16:54		 Sala Sismica INGV-Roma 89633281
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-30 16:52:15 ± 0.13
Latitude 40.6843 ± 0.0072
Longitude 16.2675 ± 0.0083
Depth (km) 19 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90444281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 780
Semi-minor axis of confidence ellipse (meter) 200
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 27
Circular confidence region, given by single value of horizontal uncertainty (meter) 780.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 57
Number of associated phases, regardless of their use for origin computation 48
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.46
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.13944
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 89633281
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-30 17:16:54

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 90444281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-30 13:20:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.COR1.EHZ. 2021-04-30T16:54:08.28 3.0 undecidable manual Sg 8.77 0
IV.MCT.HHZ. 2021-04-30T16:53:58.11 3.0 undecidable manual S 1.6 0
IV.NDIM.HHZ. 2021-04-30T16:53:47.46 3.0 positive manual P 5.63 0
IV.IMOL.HNZ. 2021-04-30T16:53:35.37 3.0 positive manual P 4.56 0
IV.MNTP.HNZ. 2021-04-30T16:53:16.33 3.0 negative manual P 9.61 0
IV.MCT.HHZ. 2021-04-30T16:53:16.57 3.0 negative manual P 3.04 0
IV.PP3.EHZ. 2021-04-30T16:53:10.59 3.0 positive manual P 2.19 0
IV.VBKN.HHZ. 2021-04-30T16:53:01.82 3.0 undecidable manual S 1.07 0
IV.LPEL.HHZ. 2021-04-30T16:52:54.62 3.0 undecidable manual P 3.68 0
IV.SGRT.HHZ. 2021-04-30T16:52:52.37 0.6 undecidable manual S 340 126.4734 94 0.85 33
OT.TAR1.HHZ. 2021-04-30T16:52:42.43 0.6 undecidable manual S 101 87.4458 96 1.3 30
IV.MGR.HHZ. 2021-04-30T16:52:41.76 0.3 undecidable manual S 225 85.5477 96 1.14 44
OT.MASS.HHE. 2021-04-30T16:52:38.15 0.6 undecidable manual S 94 73.9704 97 0.59 42
IV.NOCI.HHZ. 2021-04-30T16:52:37.16 0.6 undecidable manual S 80 67.9764 98 1.19 33
IV.SGRT.HHZ. 2021-04-30T16:52:36.37 0.3 undecidable manual P 340 126.4734 94 0.19 61
IV.CAPA.HHZ. 2021-04-30T16:52:36.08 0.6 undecidable manual S 324 64.6908 98 0.96 35
IV.VULT.HNE. 2021-04-30T16:52:35.59 0.6 undecidable manual S 299 62.3931 99 1.1 32
OT.OT06.EHZ. 2021-04-30T16:52:35.95 0.3 undecidable manual P 333 124.4865 94 0.08 62
OT.OT05.EHZ. 2021-04-30T16:52:35.50 0.3 undecidable manual P 333 121.5894 94 0.08 63
OT.OT07.EHE. 2021-04-30T16:52:33.76 0.3 undecidable manual P 336 113.5974 94 -0.44 59
IV.MGR.HHZ. 2021-04-30T16:52:30.20 0.3 undecidable manual P 225 85.5477 96 0.31 63
OT.TAR1.HHZ. 2021-04-30T16:52:30.22 0.3 undecidable manual P 101 87.4458 96 0.03 68
IV.SALB.HHE. 2021-04-30T16:52:29.04 0.6 undecidable manual P 176 89.7435 96 -1.5 26
IV.MRVN.HHZ. 2021-04-30T16:52:28.63 0.3 undecidable manual S 352 42.2244 104 -0.58 63
IV.CRAC.EHZ. 2021-04-30T16:52:28.81 0.3 undecidable manual S 157 36.4413 107 1.08 52
IV.AMUR.HHZ. 2021-04-30T16:52:28.32 0.3 undecidable manual S 49 37.5291 107 0.31 72
IV.PALZ.HHZ. 2021-04-30T16:52:28.47 0.3 undecidable manual S 318 38.628 106 0.17 72
OT.MASS.HHE. 2021-04-30T16:52:27.88 0.3 undecidable manual P 94 73.9704 97 -0.25 66
IV.NOCI.HHZ. 2021-04-30T16:52:27.32 0.3 undecidable manual P 80 67.9764 98 0.11 70
GE.MATE.HHZ. 2021-04-30T16:52:27.53 0.3 undecidable manual S 96 36.9297 107 -0.34 69
IV.SLCN.HHZ. 2021-04-30T16:52:27.36 0.3 undecidable manual P 239 62.6928 99 0.96 52
IV.MRLC.HHZ. 2021-04-30T16:52:26.98 0.3 undecidable manual P 277 65.9895 98 0.09 69
IV.CAPA.HHZ. 2021-04-30T16:52:26.75 0.3 undecidable manual P 324 64.6908 98 0.04 71
IX.SCL3.HNE.02 2021-04-30T16:52:26.96 0.3 undecidable manual P 271 63.5919 99 0.42 65
IV.VULT.HNE. 2021-04-30T16:52:26.22 0.3 undecidable manual P 299 62.3931 99 -0.13 70
IV.SIRI.HHZ. 2021-04-30T16:52:25.47 0.3 undecidable manual P 211 65.1903 98 -1.31 46
IV.PTRP.HHZ. 2021-04-30T16:52:24.24 0.6 undecidable manual S 224 25.0527 117 -0.67 44
IV.MCEL.HHZ. 2021-04-30T16:52:24.45 0.3 undecidable manual P 225 55.9995 100 -0.93 56
IV.SCHR.EHE. 2021-04-30T16:52:24.85 0.3 undecidable manual P 197 56.1993 100 -0.56 65
IV.MIGL.HHZ. 2021-04-30T16:52:23.85 0.3 undecidable manual S 121 17.0718 130 0.72 65
IX.PGN3.HNE.02 2021-04-30T16:52:22.63 0.3 undecidable manual P 253 41.5251 105 -0.57 66
IV.PALZ.HHZ. 2021-04-30T16:52:22.50 0.1 undecidable manual P 318 38.628 106 -0.28 94
IV.CRAC.EHZ. 2021-04-30T16:52:22.18 0.1 undecidable manual P 157 36.4413 107 -0.27 95
IV.MRVN.HHZ. 2021-04-30T16:52:22.86 0.1 undecidable manual P 352 42.2244 104 -0.44 89
GE.MATE.HHZ. 2021-04-30T16:52:22.14 0.1 undecidable manual P 96 36.9297 107 -0.39 91
IV.AMUR.HHZ. 2021-04-30T16:52:22.38 0.1 undecidable manual P 49 37.5291 107 -0.23 94
IV.PTRP.HHZ. 2021-04-30T16:52:20.86 0.1 undecidable manual P 224 25.0527 117 0.04 100
IV.MIGL.HHZ. 2021-04-30T16:52:19.66 0.1 undecidable manual P 121 17.0718 130 -0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MIGL.HHE. ML:2.9 0.004562132500000001 1.8592 AML other m 2021-04-30T16:52:23.94
IV.MIGL.HHN. ML:2.5 0.0021900175 0.0768 AML other m 2021-04-30T16:52:24.07
IV.PTRP.HHE. ML:1.3 0.0001064 0.3 AML other m 2021-04-30T16:52:27.48
IV.PALZ.HHN. ML:1.5 0.00010033244999999999 0.2176 AML other m 2021-04-30T16:52:28.70
GE.MATE.HHN. ML:1.8 0.00021403679999999997 0.1536 AML other m 2021-04-30T16:52:28.76
IV.PALZ.HHE. ML:1.7 0.000178 0.16 AML other m 2021-04-30T16:52:28.72
IV.PTRP.HHN. ML:1.2 0.00007096228000000001 0.3328 AML other m 2021-04-30T16:52:28.83
IV.MRVN.HHE. ML:1.5 0.000093 1.4 AML other m 2021-04-30T16:52:28.95
IV.MRVN.HHN. ML:1.5 0.00008675 1.92 AML other m 2021-04-30T16:52:28.98
GE.MATE.HHE. ML:1.7 0.0001707567 0.1408 AML other m 2021-04-30T16:52:29.46
IV.CRAC.EHE. ML:1.9 0.00029090415000000003 0.2048 AML other m 2021-04-30T16:52:29.57
IV.AMUR.HHE. ML:1.4 0.000086909635 0.1536 AML other m 2021-04-30T16:52:29.96
IV.AMUR.HHN. ML:1.4 0.0000837 0.26 AML other m 2021-04-30T16:52:31.05
IV.CRAC.EHN. ML:1.7 0.00017199999999999998 0.22 AML other m 2021-04-30T16:52:33.09
IV.MGR.HNE. ML:2.0 0.00013253094999999998 0.7296 AML other m 2021-04-30T16:52:34.45
IV.MCEL.HHE. ML:1.8 0.0001395 0.22 AML other m 2021-04-30T16:52:35.33
IV.MCEL.HNE. ML:2.0 0.000229 0.32 AML other m 2021-04-30T16:52:37.06
IV.SLCN.HNE. ML:2.1 0.0002185201 0.3584 AML other m 2021-04-30T16:52:37.64
IV.SLCN.HHE. ML:2.0 0.0002105 0.34 AML other m 2021-04-30T16:52:37.63
IV.SLCN.HHN. ML:1.9 0.0001595 0.22 AML other m 2021-04-30T16:52:37.76
IV.CAPA.HHN. ML:1.8 0.000125669605 1.7312 AML other m 2021-04-30T16:52:37.02
IV.CAPA.HNN. ML:1.5 0.000059761624999999996 1.7824 AML other m 2021-04-30T16:52:37.01
IV.CAPA.HNE. ML:1.5 0.000052593189999999996 0.1664 AML other m 2021-04-30T16:52:38.18
IV.NOCI.HHN. ML:2.2 0.00026870889999999997 0.1024 AML other m 2021-04-30T16:52:38.73
IV.SIRI.HHE. ML:1.4 0.00004106662499999999 0.1792 AML other m 2021-04-30T16:52:38.85
IV.SIRI.HHN. ML:1.4 0.000051250000000000006 0.2 AML other m 2021-04-30T16:52:38.67
IV.SIRI.HNN. ML:1.5 0.00006204837000000001 0.192 AML other m 2021-04-30T16:52:38.68
IV.NOCI.HHE. ML:2.1 0.00022494039999999997 0.1792 AML other m 2021-04-30T16:52:39.42
IV.MCEL.HHN. ML:1.5 0.000063166975 0.2944 AML other m 2021-04-30T16:52:39.37
IV.SIRI.HNE. ML:1.4 0.00004444968 0.32 AML other m 2021-04-30T16:52:40.07
IV.MCEL.HNN. ML:1.9 0.00017400000000000003 0.64 AML other m 2021-04-30T16:52:40.54
IV.SLCN.HNN. ML:2.2 0.00026667410000000004 0.7168 AML other m 2021-04-30T16:52:42.49
OT.TAR1.HHN. ML:1.9 0.0000998125 0.1664 AML other m 2021-04-30T16:52:43.70
OT.TAR1.HHE. ML:2.0 0.00012162254999999999 1.7184 AML other m 2021-04-30T16:52:43.12
IV.MGR.HHE. ML:1.6 0.00004605 0.52 AML other m 2021-04-30T16:52:44.87
IV.MGR.HHN. ML:1.5 0.00004235 0.3 AML other m 2021-04-30T16:52:45.53
IV.MGR.HNN. ML:2.1 0.00015887235 0.848 AML other m 2021-04-30T16:52:50.64
OT.OT05.EHN. ML:1.8 0.000038516979999999996 0.256 AML other m 2021-04-30T16:52:54.84
OT.OT05.EHE. ML:1.8 0.000047027815 0.1024 AML other m 2021-04-30T16:52:54.94
IV.SGRT.HHE. ML:2.0 0.00006695 0.16 AML other m 2021-04-30T16:52:55.18
IV.SGRT.HHN. ML:1.8 0.00004539800500000001 0.1024 AML other m 2021-04-30T16:52:55.10
IV.CAPA.HHE. ML:1.8 0.000103781065 0.9472 AML other m 2021-04-30T16:52:55.66
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