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.

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

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
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:1.8

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

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
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance 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.MCT.HHZ. 2021-04-30T16:53:16.57 3.0 negative manual P 3.04 0
IV.MNTP.HNZ. 2021-04-30T16:53:16.33 3.0 negative manual P 9.61 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 1.1394 94 0.85 33
OT.TAR1.HHZ. 2021-04-30T16:52:42.43 0.6 undecidable manual S 101 0.7878 96 1.3 30
IV.MGR.HHZ. 2021-04-30T16:52:41.76 0.3 undecidable manual S 225 0.7707 96 1.14 44
OT.MASS.HHE. 2021-04-30T16:52:38.15 0.6 undecidable manual S 94 0.6664 97 0.59 42
IV.NOCI.HHZ. 2021-04-30T16:52:37.16 0.6 undecidable manual S 80 0.6124 98 1.19 33
IV.SGRT.HHZ. 2021-04-30T16:52:36.37 0.3 undecidable manual P 340 1.1394 94 0.19 61
IV.CAPA.HHZ. 2021-04-30T16:52:36.08 0.6 undecidable manual S 324 0.5828 98 0.96 35
IV.VULT.HNE. 2021-04-30T16:52:35.59 0.6 undecidable manual S 299 0.5621 99 1.1 32
OT.OT06.EHZ. 2021-04-30T16:52:35.95 0.3 undecidable manual P 333 1.1215 94 0.08 62
OT.OT05.EHZ. 2021-04-30T16:52:35.50 0.3 undecidable manual P 333 1.0954 94 0.08 63
OT.OT07.EHE. 2021-04-30T16:52:33.76 0.3 undecidable manual P 336 1.0234 94 -0.44 59
IV.MGR.HHZ. 2021-04-30T16:52:30.20 0.3 undecidable manual P 225 0.7707 96 0.31 63
OT.TAR1.HHZ. 2021-04-30T16:52:30.22 0.3 undecidable manual P 101 0.7878 96 0.03 68
IV.SALB.HHE. 2021-04-30T16:52:29.04 0.6 undecidable manual P 176 0.8085 96 -1.5 26
IV.CRAC.EHZ. 2021-04-30T16:52:28.81 0.3 undecidable manual S 157 0.3283 107 1.08 52
IV.AMUR.HHZ. 2021-04-30T16:52:28.32 0.3 undecidable manual S 49 0.3381 107 0.31 72
IV.PALZ.HHZ. 2021-04-30T16:52:28.47 0.3 undecidable manual S 318 0.3480 106 0.17 72
IV.MRVN.HHZ. 2021-04-30T16:52:28.63 0.3 undecidable manual S 352 0.3804 104 -0.58 63
IV.NOCI.HHZ. 2021-04-30T16:52:27.32 0.3 undecidable manual P 80 0.6124 98 0.11 70
GE.MATE.HHZ. 2021-04-30T16:52:27.53 0.3 undecidable manual S 96 0.3327 107 -0.34 69
IV.SLCN.HHZ. 2021-04-30T16:52:27.36 0.3 undecidable manual P 239 0.5648 99 0.96 52
OT.MASS.HHE. 2021-04-30T16:52:27.88 0.3 undecidable manual P 94 0.6664 97 -0.25 66
IX.SCL3.HNE.02 2021-04-30T16:52:26.96 0.3 undecidable manual P 271 0.5729 99 0.42 65
IV.VULT.HNE. 2021-04-30T16:52:26.22 0.3 undecidable manual P 299 0.5621 99 -0.13 70
IV.MRLC.HHZ. 2021-04-30T16:52:26.98 0.3 undecidable manual P 277 0.5945 98 0.09 69
IV.CAPA.HHZ. 2021-04-30T16:52:26.75 0.3 undecidable manual P 324 0.5828 98 0.04 71
IV.SIRI.HHZ. 2021-04-30T16:52:25.47 0.3 undecidable manual P 211 0.5873 98 -1.31 46
IV.MCEL.HHZ. 2021-04-30T16:52:24.45 0.3 undecidable manual P 225 0.5045 100 -0.93 56
IV.SCHR.EHE. 2021-04-30T16:52:24.85 0.3 undecidable manual P 197 0.5063 100 -0.56 65
IV.PTRP.HHZ. 2021-04-30T16:52:24.24 0.6 undecidable manual S 224 0.2257 117 -0.67 44
IV.MIGL.HHZ. 2021-04-30T16:52:23.85 0.3 undecidable manual S 121 0.1538 130 0.72 65
IV.CRAC.EHZ. 2021-04-30T16:52:22.18 0.1 undecidable manual P 157 0.3283 107 -0.27 95
IV.MRVN.HHZ. 2021-04-30T16:52:22.86 0.1 undecidable manual P 352 0.3804 104 -0.44 89
GE.MATE.HHZ. 2021-04-30T16:52:22.14 0.1 undecidable manual P 96 0.3327 107 -0.39 91
IV.AMUR.HHZ. 2021-04-30T16:52:22.38 0.1 undecidable manual P 49 0.3381 107 -0.23 94
IX.PGN3.HNE.02 2021-04-30T16:52:22.63 0.3 undecidable manual P 253 0.3741 105 -0.57 66
IV.PALZ.HHZ. 2021-04-30T16:52:22.50 0.1 undecidable manual P 318 0.3480 106 -0.28 94
IV.PTRP.HHZ. 2021-04-30T16:52:20.86 0.1 undecidable manual P 224 0.2257 117 0.04 100
IV.MIGL.HHZ. 2021-04-30T16:52:19.66 0.1 undecidable manual P 121 0.1538 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
IV.MCT.HHN. ML:2.7 0.00002665945 0.2816 AML other m 2021-04-30T16:53:52.76
IV.MCT.HHE. ML:2.7 0.000026030855 0.064 AML other m 2021-04-30T16:54:29.33
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download