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High-rate phase association with travel time neural fields.

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Python · 299 lines · 12 KB · MIT

  1. from torch.utils.data import Dataset, DataLoader
  2. import numpy as np
  3. from tqdm import tqdm
  4. import skfmm
  5. from obspy import UTCDateTime as UT
  6. import pandas as pd
  7. import multiprocessing
  8. class WaveSpeedDataset(Dataset):
  9. def __init__(self, V_trains, p_train):
  10. self.data_wavespeed=np.array(V_trains,dtype=np.float32)
  11. self.n_wavespeed=len(V_trains)
  12. self.p_train=np.array(p_train)
  13. def __len__(self):
  14. return self.n_wavespeed
  15. def __getitem__(self, idx):
  16. image = {'image':self.data_wavespeed[idx],'p': self.p_train}
  17. return image
  18. def get_traveling_time_multi(V_list,station_df,config,dx=25,align_station=False):
  19. station_df=station_df.copy()
  20. grid_size_x= int((config['x(km)'][1]-config['x(km)'][0])/dx+1)
  21. grid_size_y= int((config['y(km)'][1]-config['y(km)'][0])/dx+1)
  22. grid_size_z= int((config['z(km)'][1]-config['z(km)'][0])/dx+1)
  23. xx = np.linspace(config['x(km)'][0],config['x(km)'][1],grid_size_x)
  24. yy = np.linspace(config['y(km)'][0],config['y(km)'][1],grid_size_y)
  25. zz = np.linspace(config['z(km)'][0],config['z(km)'][1],grid_size_z)
  26. X, Y, Z = np.meshgrid(xx,yy,zz)
  27. X=X.transpose(1,0,2)
  28. Y=Y.transpose(1,0,2)
  29. Z=Z.transpose(1,0,2)
  30. if align_station:
  31. station_df['x(km)'] = station_df['x(km)'].apply(lambda x: xx[np.argmin(np.abs(np.array(xx) - x))])
  32. station_df['y(km)'] = station_df['y(km)'].apply(lambda x: yy[np.argmin(np.abs(np.array(yy) - x))])
  33. station_df['z(km)'] = station_df['z(km)'].apply(lambda x: zz[np.argmin(np.abs(np.array(zz) - x))])
  34. station_locs=np.array([station_df['x(km)'],station_df['y(km)'],station_df['z(km)']]).T
  35. loc_src_x=station_locs[:,0]
  36. loc_src_y=station_locs[:,1]
  37. loc_src_z=station_locs[:,2]
  38. n_station=len(loc_src_x)
  39. n_wavespeed=len(V_list)
  40. travel_time = np.zeros((n_wavespeed,n_station,grid_size_x,grid_size_y,grid_size_z))
  41. for j in tqdm(range(n_wavespeed)):
  42. V=V_list[j]
  43. #V=np.ones_like(X)
  44. for i in range(n_station):
  45. phi = ((X-loc_src_x[i])**2+(Y-loc_src_y[i])**2+(Z-loc_src_z[i])**2)
  46. #print(np.min(phi))
  47. #phi=phi-np.min(phi)
  48. phi=phi-0.001
  49. try:
  50. tt= skfmm.travel_time(phi,V,order=2,dx=dx)
  51. except:
  52. tt = skfmm.travel_time(phi,V,order=1,dx=dx)
  53. travel_time[j,i,:,:,:]=tt
  54. return travel_time
  55. def compute_task(inputs):
  56. phi,V,dx=inputs
  57. result = skfmm.travel_time(phi,V,order=2,dx=dx).astype(dtype=np.float16)
  58. return result
  59. def get_traveling_time_multi_mp(V_list,station_df,config,dx=25,align_station=False):
  60. grid_size_x= int((config['x(km)'][1]-config['x(km)'][0])/dx+1)
  61. grid_size_y= int((config['y(km)'][1]-config['y(km)'][0])/dx+1)
  62. grid_size_z= int((config['z(km)'][1]-config['z(km)'][0])/dx+1)
  63. xx = np.linspace(config['x(km)'][0],config['x(km)'][1],grid_size_x)
  64. yy = np.linspace(config['y(km)'][0],config['y(km)'][1],grid_size_y)
  65. zz = np.linspace(config['z(km)'][0],config['z(km)'][1],grid_size_z)
  66. X, Y, Z = np.meshgrid(xx,yy,zz)
  67. X=X.transpose(1,0,2)
  68. Y=Y.transpose(1,0,2)
  69. Z=Z.transpose(1,0,2)
  70. if align_station:
  71. station_df['x(km)'] = station_df['x(km)'].apply(lambda x: xx[np.argmin(np.abs(np.array(xx) - x))])
  72. station_df['y(km)'] = station_df['y(km)'].apply(lambda x: yy[np.argmin(np.abs(np.array(yy) - x))])
  73. station_df['z(km)'] = station_df['z(km)'].apply(lambda x: zz[np.argmin(np.abs(np.array(zz) - x))])
  74. station_locs=np.array([station_df['x(km)'],station_df['y(km)'],station_df['z(km)']]).T
  75. loc_src_x=station_locs[:,0]
  76. loc_src_y=station_locs[:,1]
  77. loc_src_z=station_locs[:,2]
  78. n_station=len(loc_src_x)
  79. n_wavespeed=len(V_list)
  80. data_list=[]
  81. for j in tqdm(range(n_wavespeed)):
  82. V=V_list[j]
  83. #V=np.ones_like(X)
  84. for i in range(n_station):
  85. phi = ((X-loc_src_x[i])**2+(Y-loc_src_y[i])**2+(Z-loc_src_z[i])**2)
  86. #print(np.min(phi))
  87. #phi=phi-np.min(phi)
  88. phi=phi-0.001
  89. # try:
  90. # tt= skfmm.travel_time(phi,V,order=2,dx=dx)
  91. # except:
  92. # tt = skfmm.travel_time(phi,V,order=1,dx=dx)
  93. data_list.append((phi,V,dx))
  94. pool = multiprocessing.Pool()
  95. result_iter = pool.imap(compute_task, data_list)
  96. result_list = []
  97. for result in tqdm(result_iter, total=n_wavespeed*n_station):
  98. result_list.append(result)
  99. pool.close()
  100. pool.join()
  101. result_list=np.array(result_list).astype(np.float16).reshape(n_wavespeed,n_station,grid_size_x,grid_size_y,grid_size_z)
  102. return result_list
  103. def add_gaussian_pertubation(x,y,z,sx,sy,sz,A,grid_size):
  104. Y,X,Z = np.meshgrid(np.linspace(0,1,grid_size), np.linspace(0,1,grid_size),np.linspace(0,1,grid_size))
  105. temp=(X-x)**2/sx**2+(Y-y)**2/sy**2+(Z-z)**2/sz**2
  106. temp=np.exp(-temp/2)
  107. return A*temp/temp.max()
  108. def gen_station(n_station,config,seed=0):
  109. np.random.seed(seed)
  110. dx =config['dx(km)']
  111. grid_size_x= int((config['x(km)'][1]-config['x(km)'][0])/dx+1)
  112. grid_size_y= int((config['y(km)'][1]-config['y(km)'][0])/dx+1)
  113. grid_size_z= int((config['z(km)'][1]-config['z(km)'][0])/dx+1)
  114. x = np.linspace(config['x(km)'][0],config['x(km)'][1],grid_size_x)
  115. y = np.linspace(config['y(km)'][0],config['y(km)'][1],grid_size_y)
  116. z = np.linspace(config['z(km)'][0],config['z(km)'][1],grid_size_z)
  117. station_loc=[]
  118. for i in range(n_station):
  119. loc=[x[np.random.randint(len(x))],y[np.random.randint(len(y))],0.0]
  120. #loc=[x[2],y[18],0.0]
  121. station_loc.append(loc)
  122. station_df = []
  123. for i in range(n_station):
  124. loc=station_loc[i]
  125. station_df.append({
  126. "id": 'S.'+str(i)+'.BH',
  127. "x(km)": loc[0],
  128. "y(km)": loc[1],
  129. "z(km)": loc[2]
  130. })
  131. station_df=pd.DataFrame(station_df)
  132. return station_df
  133. def gen_source(n_source,frequence,config,seed=0,randomtime=False):
  134. np.random.seed(seed)
  135. source_loc=[]
  136. source_loc_lindex=[]
  137. source_time=[]
  138. dx =config['dx(km)']
  139. grid_size_x= int((config['x(km)'][1]-config['x(km)'][0])/dx+1)
  140. grid_size_y= int((config['y(km)'][1]-config['y(km)'][0])/dx+1)
  141. grid_size_z= int((config['z(km)'][1]-config['z(km)'][0])/dx+1)
  142. x = np.linspace(config['x(km)'][0],config['x(km)'][1],grid_size_x)
  143. y = np.linspace(config['y(km)'][0],config['y(km)'][1],grid_size_y)
  144. z = np.linspace(config['z(km)'][0],config['z(km)'][1],grid_size_z)
  145. Tmax=60/frequence*n_source
  146. if randomtime:
  147. Tlist=np.random.rand(n_source)*Tmax
  148. else:
  149. Tlist=np.linspace(0,Tmax,n_source)
  150. for n in range(n_source):
  151. #idxs=[np.random.randint(len(x)),np.random.randint(len(y)),np.random.randint(len(z))]
  152. idxs=[np.random.randint(1,len(x)-1),np.random.randint(1,len(y)-1),np.random.randint(11,len(z)-1)] #avoid boundary
  153. source_loc_lindex.append(idxs)
  154. source_loc.append([x[idxs[0]],y[idxs[1]],z[idxs[2]]])
  155. #source_time.append(np.random.rand()*60/frequence*8)
  156. source_time.append(Tlist[n])
  157. catalog_df=[]
  158. for source_index in range(n_source):
  159. loc=source_loc[source_index]
  160. catalog_df.append({
  161. "event_index": source_index,
  162. "time": np.datetime64(int(1000*source_time[source_index]), 'ms'),
  163. "x(km)": loc[0],
  164. "y(km)": loc[1],
  165. "z(km)": loc[2],
  166. })
  167. catalog_df=pd.DataFrame(catalog_df)
  168. catalog_df['time'] = catalog_df['time'].apply(lambda x: UT(x))
  169. return source_loc,source_loc_lindex,source_time,catalog_df
  170. import torch
  171. class TravelTimeDataset(Dataset):
  172. def __init__(self,travel_time_list,V_paramter_list,config,station_df):
  173. self.n_wavespeed=len(V_paramter_list)
  174. self.n_station=len(station_df)
  175. self.dx=config['dx(km)']
  176. self.input_scale=100
  177. self.out_scale=100
  178. grid_size_x= int((config['x(km)'][1]-config['x(km)'][0])/dx+1)
  179. grid_size_y= int((config['y(km)'][1]-config['y(km)'][0])/dx+1)
  180. grid_size_z= int((config['z(km)'][1]-config['z(km)'][0])/dx+1)
  181. x = np.linspace(config['x(km)'][0],config['x(km)'][1],grid_size_x)
  182. y = np.linspace(config['y(km)'][0],config['y(km)'][1],grid_size_y)
  183. z = np.linspace(config['z(km)'][0],config['z(km)'][1],grid_size_z)
  184. X, Y, Z = np.meshgrid(x,y,z)
  185. X=X.transpose(1,0,2)
  186. Y=Y.transpose(1,0,2)
  187. Z=Z.transpose(1,0,2)
  188. self.X =(X-config['x(km)'][0])/(config['x(km)'][1]-config['x(km)'][0])
  189. self.Y =(Y-config['y(km)'][0])/(config['y(km)'][1]-config['y(km)'][0])
  190. self.Z =(Z-config['z(km)'][0])/(config['z(km)'][1]-config['z(km)'][0])
  191. self.grid_sizes=[grid_size_x,grid_size_y,grid_size_z]
  192. self.travel_time_list=travel_time_list
  193. self.n_gt=grid_size_x*grid_size_y*grid_size_z
  194. self.V_paramter_list=V_paramter_list
  195. ##station
  196. print(self.X.shape,self.Y.shape,self.Z.shape)
  197. print(travel_time_list.shape)
  198. #self.station_locs=np.array([station_df['x(km)'],station_df['y(km)'],station_df['z(km)']])
  199. def __len__(self):
  200. return self.n_wavespeed*self.n_gt
  201. def __getitem__(self, idx):
  202. idx_wavespeed,id_= idx//self.n_gt,idx%self.n_gt
  203. idx,id_= id_//(self.grid_sizes[1]*self.grid_sizes[2]),id_%(self.grid_sizes[1]*self.grid_sizes[2])
  204. idy,idz= id_//self.grid_sizes[2],id_%self.grid_sizes[2]
  205. input=np.concatenate([self.V_paramter_list[idx_wavespeed], [self.X[idx,idy,idz]], [self.Y[idx,idy,idz]],[self.Z[idx,idy,idz]]])
  206. output=self.travel_time_list[idx_wavespeed,:,idx,idy,idz]
  207. image = {'in':input,'out':output}
  208. return image
  209. class TravelTimeDataset_NF(Dataset):
  210. def __init__(self,travel_time_list,WaveSpeedData,p_list,model_autoencoder,device,config,beta=0):
  211. self.n_wavespeed=len(WaveSpeedData)
  212. self.dx=config['dx(km)']
  213. dx=self.dx
  214. self.beta=beta
  215. #ATE_train_loader = torch.utils.data.DataLoader(WaveSpeedData, batch_size=128, shuffle=False)
  216. model_autoencoder.eval()
  217. with torch.no_grad():
  218. data=torch.tensor(WaveSpeedData.data_wavespeed).unsqueeze(1).float().to(device)
  219. _,emb=model_autoencoder(data)
  220. p=emb.clone().detach().cpu().squeeze()
  221. self.z=torch.sigmoid(self.beta*p).numpy()
  222. self.p_list=p_list
  223. if self.z.ndim == 1:
  224. self.z = np.expand_dims(self.z, axis=-1)
  225. print('z,',self.z[:5])
  226. grid_size_x= int((config['x(km)'][1]-config['x(km)'][0])/dx+1)
  227. grid_size_y= int((config['y(km)'][1]-config['y(km)'][0])/dx+1)
  228. grid_size_z= int((config['z(km)'][1]-config['z(km)'][0])/dx+1)
  229. x = np.linspace(config['x(km)'][0],config['x(km)'][1],grid_size_x)
  230. y = np.linspace(config['y(km)'][0],config['y(km)'][1],grid_size_y)
  231. z = np.linspace(config['z(km)'][0],config['z(km)'][1],grid_size_z)
  232. X, Y, Z = np.meshgrid(x,y,z)
  233. X=X.transpose(1,0,2)
  234. Y=Y.transpose(1,0,2)
  235. Z=Z.transpose(1,0,2)
  236. self.X =(X-config['x(km)'][0])/(config['x(km)'][1]-config['x(km)'][0])
  237. self.Y =(Y-config['y(km)'][0])/(config['y(km)'][1]-config['y(km)'][0])
  238. self.Z =(Z-config['z(km)'][0])/(config['z(km)'][1]-config['z(km)'][0])
  239. self.grid_sizes=[grid_size_x,grid_size_y,grid_size_z]
  240. self.travel_time_list=travel_time_list
  241. self.n_gt=grid_size_x*grid_size_y*grid_size_z
  242. #self.V_paramter_list=V_paramter_list
  243. ##station
  244. print(self.X.shape,self.Y.shape,self.Z.shape)
  245. print(travel_time_list.shape)
  246. #self.station_locs=np.array([station_df['x(km)'],station_df['y(km)'],station_df['z(km)']])
  247. def __len__(self):
  248. return self.n_wavespeed*self.n_gt
  249. def __getitem__(self, idx):
  250. idx_wavespeed,id_= idx//self.n_gt,idx%self.n_gt
  251. idx,id_= id_//(self.grid_sizes[1]*self.grid_sizes[2]),id_%(self.grid_sizes[1]*self.grid_sizes[2])
  252. idy,idz= id_//self.grid_sizes[2],id_%self.grid_sizes[2]
  253. input=np.concatenate([self.z[idx_wavespeed], [self.X[idx,idy,idz]], [self.Y[idx,idy,idz]],[self.Z[idx,idy,idz]]])
  254. output=self.travel_time_list[idx_wavespeed,:,idx,idy,idz]
  255. p=self.p_list[idx_wavespeed]
  256. image = {'in':input,'out':output,'p':p}
  257. return image

NF_utils.py at commit 7adf666, under MIT · at the source

Overview

Authors: Cheng Shi1,2, Giulio Poggiali3, Chris Marone3,4, Maarten V. de Hoop5, Ivan Dokmanić1,6
  1. Department of Mathematics and Computer Science, University of Basel,Basel, Switzerland
  2. Département d’Informatique, École normale supérieure, PSL University,Paris, France
  3. Department of Earth Sciences, La Sapienza Università di Roma,Roma, Italy
  4. Department of Geosciences, Pennsylvania State University,University Park, PA USA
  5. Simons Chair in Computational and Applied Mathematics and Earth Science, Rice University,Houston, TX USA
  6. Department of ECE, University of Illinois at Urbana–Champaign,Champaign, IL USA
Journal: Nature communications, volume 17, issue 1, article 8140
Dates: received 15 March 2024; accepted 27 May 2026; published online 30 June 2026
Type: Research article · Language: English
License: CC BY-NC-ND
Identifiers: DOI 10.1038/s41467-026-74092-y · PMID 42380143 · PMCID PMC13457860 · OpenAlex W7166663565
Open access: gold, a free copy (OpenAlex)
Status: code verified
Methods: Statistics, Machine learning
Keywords: Seismology, Computer science
Topic: Seismology and Earthquake Studies (Artificial Intelligence, Computer Science), according to OpenAlex
Funding: Simons Foundation under the MATH+X program, and Department of Energy, grant DE-SC0020345; European Research Council (ERC) Starting Grant 852821—SWING
Citations: cited by 1 paper (Europe PMC); 56 references in the paper

Abstract

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DaDaCheng/phase_association

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Size: 12 files, 9 scripts
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Found in: “Code availability”
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Not found: CITATION.cff, tests, continuous integration, documentation
Tools: NumPy (5 files), PyTorch (5 files), pandas (4 files), SciPy (2 files), Matplotlib (1 file), Plotly (1 file), scikit-learn (1 file)
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Zenodo 19766525

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Availability: 1 check, the latest on 27 September 2026: the link answers (HTTP 200)
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Cite

This paper

Shi, C., Poggiali, G., Marone, C., de Hoop, M. V., & Dokmanić, I. (2026). High-rate phase association with travel time neural fields. Nature communications, 17(1), 8140. https://doi.org/10.1038/s41467-026-74092-y

BibTeX

@article{shi2026high,
author = {Shi, Cheng and Poggiali, Giulio and Marone, Chris and de Hoop, Maarten V. and Dokmanić, Ivan},
title = {{High-rate phase association with travel time neural fields}},
journal = {Nature communications},
year = {2026},
month = jun,
volume = {17},
number = {1},
pages = {8140},
publisher = {Nature Publishing Group},
issn = {2041-1723},
doi = {10.1038/s41467-026-74092-y},
url = {https://doi.org/10.1038/s41467-026-74092-y},
pmid = {42380143},
pmcid = {PMC13457860}
}

RIS

TY - JOUR
AU - Shi, Cheng
AU - Poggiali, Giulio
AU - Marone, Chris
AU - de Hoop, Maarten V.
AU - Dokmanić, Ivan
TI - High-rate phase association with travel time neural fields
T2 - Nature communications
J2 - Nat Commun
PY - 2026
DA - 2026/06/30
VL - 17
IS - 1
SP - 8140
SN - 2041-1723
PB - Nature Publishing Group
DO - 10.1038/s41467-026-74092-y
UR - https://doi.org/10.1038/s41467-026-74092-y
LA - en
ER -

CSL-JSON

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"id": "10.1038/s41467-026-74092-y",
"type": "article-journal",
"title": "High-rate phase association with travel time neural fields",
"container-title": "Nature communications",
"author": [
{
"family": "Shi",
"given": "Cheng"
},
{
"family": "Poggiali",
"given": "Giulio"
},
{
"family": "Marone",
"given": "Chris"
},
{
"family": "de Hoop",
"given": "Maarten V."
},
{
"family": "Dokmanić",
"given": "Ivan"
}
],
"container-title-short": "Nat Commun",
"volume": "17",
"issue": "1",
"page": "8140",
"DOI": "10.1038/s41467-026-74092-y",
"PMID": "42380143",
"PMCID": "PMC13457860",
"ISSN": "2041-1723",
"publisher": "Nature Publishing Group",
"URL": "https://doi.org/10.1038/s41467-026-74092-y",
"language": "en",
"issued": {
"date-parts": [
[
2026,
6,
30
]
]
}
}

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